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A low-velocity flow over a smooth stream bed produces a

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A low-velocity flow over a smooth stream bed produces a

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Skeletal and smooth muscles move when nerve impulses sent from What stimulate the muscle fibers telling them to either contract or relax A.PNS B.head C. CNS

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Answer: The correct answer is C; CNS.

Explanation:

The CNS is short of the central nervous system. This system sends nerve impulses to stimulate both the skeletal and smooth muscles making them move, contract, and relax. The nervous system is made up of both the central nervous system and the peripheral nervous system. The main organs in the CNS are the spinal cord and the brain. The central nervous system is comprised of billions of nerve cells. The CNS controls bodily functions, your thoughts, and even your memory.

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The muscular system is composed of approximately 600 smooth, cardiac or skeletal muscles ?

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The muscular system is composed of approximately 600 smooth, cardiac or skeletal muscles ?

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Read the following exchange between Romeo and Juliet from act I of Romeo and Juliet. What does the excerpt reveal about the love between the two young people? ROMEO: (to JULIET) If I profane with my unworthiest hand This holy shrine, the gentle fine is this: My lips, two blushing pilgrims, ready stand To smooth that rough touch with a tender kiss. JULIET: Good pilgrim, you do wrong your hand too much, Which mannerly devotion shows in this; For saints have hands that pilgrims’ hands do touch, And palm to palm is holy palmers’ kiss. ROMEO: Have not saints lips, and holy palmers too? JULIET: Ay, pilgrim, lips that they must use in prayer. Their love is based on both physical and emotional attraction. Their love is shallow and based on defying their families. Their love is driven by their intellectual needs. Their love is instant and illogical. NextReset

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Answer:

Dogs can be strong companions, but they also have needs that many people forget to address.

Explanation:

The author’s claim is that many people forget to address the needs of their dogs. The author continues to talk about some of those needs, like regular washing and grooming to avoid becoming matted and sick. The author is not simply talking about washing and grooming, but other needs the dogs might have as well. These could include things like walking, a proper diet, or brushing their teeth.

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What is the relationship between structure and function in the selected muscle? – Muscle – Human Cardiac – Smooth Muscle – Skeletal Muscle

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There are two systems in the human body that are responsible for the coordination between the functions of different systems to achieve the unity of the living organism’s body. These two systems are the nervous system and the endocrine system. The action of the nervous system is fast and takes a short time, while the action of the endocrine system is slow and takes a long time.

The functional unit of the nervous system is the nerve cell or the neuron. The neuron consists of a cell body and the axon. The cell body starts with the dendrites that receive the messages or the impulses from other neurons or from different sense organs or receptors. These impulses are then transmitted through the cell body. The cell body contains a nucleus and different organelles which help the nerve cell to perform its functions. The nerve impulse is then transmitted to the axon.

The axon is an extension from the cell body. There are some cells called Schwan cells that secrete a myelin sheath to insulate the axon from the surrounding medium. The insulated axons have more ability to conduct the impulses than non-insulated axons. The axon ends with the terminal arborizations. The terminal arborizations of a nerve cell connect to the dendrites of the next cell or to the afferent organ. The gaps between the dendrites and the terminal arborizations are called the synapses.

The nerve impulse is an electrochemical phenomenon i.e. an electrical phenomenon with a chemical nature. The membrane of the axon acts as a barrier between an outside positively charged medium and an inside negatively charged medium. This makes a potential difference of  -70mV. This state is called the resting potential. When the membrane is subjected to a stimulus, the positive charges enter to inside and the negative charges exit to the outside. The potential difference now becomes +40mV. This state is called the depolarization state. The point of stimulation acts as a new stimulus for the next point and so on. The membrane sooner gains its permeability again and the positive charges return to the outside and the negative charges to inside. This state is called repolarization.

The nerve impulse reaches the synapse. There are some neurotransmitters that are excited by the nerve impulse coming and carry the message across the membrane. Some receptors receive theses neurotransmitters on the dendrites of the next neuron. These receptors act as a stimulus for the new cell.

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Which trait do cardiac and smooth muscle share?

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Answer: The correct answer is C; CNS.

Explanation:

The CNS is short of the central nervous system. This system sends nerve impulses to stimulate both the skeletal and smooth muscles making them move, contract, and relax. The nervous system is made up of both the central nervous system and the peripheral nervous system. The main organs in the CNS are the spinal cord and the brain. The central nervous system is comprised of billions of nerve cells. The CNS controls bodily functions, your thoughts, and even your memory.

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Also called smooth muscles , they are involuntary and function automatically without conscious will they are found in the internal organs of the body such as the digestive or respiratory system

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Answer:

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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A scientist adds heat to each of the following substances. Which will probably absorb the most heat before its temperature changes significantly? 50 g of solid copper 50 g of solid iron 50 g of liquid water 50 g of sand Question 2(Multiple Choice Worth 2 points) A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowing outward in different directions. Which of these best explains this observation? The bonds between hydrogen and oxygen atoms are very strong. The electrons in the atoms attract the electrons in the other atoms. Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid. Water molecules near the surface produce more buoyant force than water molecules within the liquid. Question 3(Multiple Choice Worth 2 points) Which of these best explains what happens when the ionic substance calcium chloride (CaCl2) dissolves in water? The oxygen atoms in the water molecules are attracted to the Ca2+ ions. The oxygen atoms in the water molecules are attracted to the Cl− ions. The hydrogen atoms in the water molecules are attracted to the Ca2+ ions. The oxygen atoms in the water molecules are attracted to the H+ ions. Question 4(Multiple Choice Worth 2 points) Which of these statements about water is true? Its atoms share electrons equally. It can dissolve all known substances. Its molecules are farther apart in the solid state than in the liquid state. It has a lower specific heat than nearly all known metals.

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The gravitational force Fg between two objects is given by the equation:

Fg=(G*m₁*m₂)/r₂, where G=6.67*10^-11 m³ kg⁻¹ s⁻² is the gravitational constant, m₁ and m₂ are the masses of the two bodies and r is the distance between those bodies. 

Due to the gravitational attraction the pencil and the eraser will attract if we there is no friction on the surface. 

m₁=10 g=0.01 kg is the mass of the pencil
m₂=20 g=0.02 kg is the mass of the eraser
r=2.5 cm = 0.025 m

First we calculate the Fg:

Fg={(6.67*10^-11)*0.01*0.02}/(0.025²)=2.1344*10^-11 N

To get the velocity v of the pencil:

v²=2as, where a is the acceleration of the pencil and s is the path. In our case s=r so we can write:

v²=2ar

a=Fg/m₁= 2.133*10^-9 m/s²

v²=2*(2.133*10^-9)*0.025=1.0665*10^-10

v=√(1.0665*10^-10)=1.0327*10^-5 m/s

We have the velocity and the acceleration, so we can calculate the time t with the equation:

t=v/a=(1.0327*10^-5)/(2.133*10^-9)=4841.6 s

1 hour has 3600 s so when we divide time t in seconds by 3600 we get time T in hours:

T=t/3600=4841.6/3600=1.3449 h. 

So the time for the pencil and eraser to touch is T=1.3449 hours. 

Also time T can be expressed like T= 1h and 20 mins and 41.64 s

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Areas near oceans or large lakes tend to have more moderate climates than do areas far from large bodies of water. Which of these statements best explains this observation? Hydrogen and oxygen atoms share electrons in a water molecule. Lakes and oceans contain dissolved solids. Water has a very high specific heat. Water produces buoyant forces. Question 2(Multiple Choice Worth 2 points) A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance? It expands when it freezes. It is highly colored. It exists only as a gas. It does not dissolve ionic compounds. Question 3(Multiple Choice Worth 2 points) Which of the following properties of water is due primarily to the uneven distribution of charge between the hydrogen and oxygen atoms? its color its taste its ability to dissolve ionic substances its ability to produce buoyant forces Question 4(Multiple Choice Worth 2 points) A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowing outward in different directions. Which of these best explains this observation? The bonds between hydrogen and oxygen atoms are very strong. The electrons in the atoms attract the electrons in the other atoms. Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid. Water molecules near the surface produce more buoyant force than water molecules within the liquid.

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The gravitational force Fg between two objects is given by the equation:

Fg=(G*m₁*m₂)/r₂, where G=6.67*10^-11 m³ kg⁻¹ s⁻² is the gravitational constant, m₁ and m₂ are the masses of the two bodies and r is the distance between those bodies. 

Due to the gravitational attraction the pencil and the eraser will attract if we there is no friction on the surface. 

m₁=10 g=0.01 kg is the mass of the pencil
m₂=20 g=0.02 kg is the mass of the eraser
r=2.5 cm = 0.025 m

First we calculate the Fg:

Fg={(6.67*10^-11)*0.01*0.02}/(0.025²)=2.1344*10^-11 N

To get the velocity v of the pencil:

v²=2as, where a is the acceleration of the pencil and s is the path. In our case s=r so we can write:

v²=2ar

a=Fg/m₁= 2.133*10^-9 m/s²

v²=2*(2.133*10^-9)*0.025=1.0665*10^-10

v=√(1.0665*10^-10)=1.0327*10^-5 m/s

We have the velocity and the acceleration, so we can calculate the time t with the equation:

t=v/a=(1.0327*10^-5)/(2.133*10^-9)=4841.6 s

1 hour has 3600 s so when we divide time t in seconds by 3600 we get time T in hours:

T=t/3600=4841.6/3600=1.3449 h. 

So the time for the pencil and eraser to touch is T=1.3449 hours. 

Also time T can be expressed like T= 1h and 20 mins and 41.64 s

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MAM VS MAN, MAN VS SOCIETY, MAN VS NATURE, MAN VS SELF? HELP PLEASE: Read the following selection from Act III of Romeo and Juliet. What conflict does the line in bold most closely represent? JULIET Shall I speak ill of him that is my husband? Ah, poor my lord, what tongue shall smooth thy name, When I, thy three-hours wife, have mangled it?

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Well; You have the classics

1984, you might have been asked to read this one already in school, if not I suggest going ahead and reading it; its fun to be ahead of your class. 

Originally published in 1949 by George Orwell, 1984 depicts a dystopian world of the ‘future’. The book is less of a prediction more then it is a warning of what could be. It follows one character who is desperately trying to remember what real life is like, and gets tangled up in all sorts of messes along the way.

You could read Alice in Wonderland or Mary Poppins, theres a million great classics out there Im sure you can find on any website. 

Personally I prefer fantasy novels; 

Brandon Sanderson’s The Rithmatist 
This book follows a young student through a steampunk style, magic infused world. It takes a moment to not chuckle at the concept of monsters that are essentially drawings, but its a very well done book with beautiful writing and mental scenery 

Patrick Rothfuss’s, The Name of the Wind 
This is my favorite book of all time. Patrick Rothfuss’s work is honestly amazing in this book. Mind you its probably not all that wise for the feint of heart through perhaps the second chapter; but it really is amazing. The sculpting of the world, the depth of the characters its utterly masterful. The story opens with Kote, a fairly normal seeming innkeeper and his dark haired companion Bast. Fairly normal until a man happens upon the inn, looking for a certain Kvothe, a man thought to just be a legend and a story… and Kote’s past is drug up, and other things that should probably be better left alone.

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Give 3 jobs for smooth ER

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Give 3 jobs for smooth ER
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Why is the smooth muscle cell shaped the way it is? …?

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Posted in Biology

Smooth muscle cells are contractile and will contract from many different agents such as hormones travelling in the blood and neurotransmitters from the autonomic nervous system. The smooth muscle cells are coupled together so that when one cell contracts, the contraction is relayed to the next. This contractile ability is important in the vascular system as it helps regulate blood pressure by changing the size of the lumen of the vessel. 
This contractile feature also enables the movement of food through the digestive tract. Rhythmic contractions of smooth muscle cells, called peristalsis, moves the food along.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!


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what is a small structure within the cell that builds proteins called? …?

The correct answer for this question would be RIBOSOMES. Ribosomes are the small structures within the cell that builds proteins and this process is called Protein Biosynthesis. Protein is essential in the repair of damages as well as directing chemical processes. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum. Hope this helps.

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What is the different between cdc and cdk in cell cycle control??? …?

CDKs are present all throughout the cell cycle, but are inactive if the cyclin is not present. Cyclins are gradually built up, and reach a max at a certain point, which starts their particular phase. They associate with the cdks, activating them, and letting them do their job, before being ubiquitinated by another protein complex(that they themselves have activated) and disposed of by the proteasome, again inactivating the cdk. 

Cyclins always ahve to bind to cdks, they themselves cannot do anything, and neither can the cdks. Cyclins activate cdks. 

Cdc stands for cell division cycle, and is another word for cyclin. There are many different kinds, each specific for certain phases, and they only associate with certain cdk’s.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Posted in Biology

2. While looking at a cell under a microscope, a scientist is able to see a biological molecule. This molecule is a nucleic acid with a ladder structure and contains the nitrogenous bases adenine, thymine, cytosine, and guanine. Based on this information, what conclusion can the scientist draw regarding this nucleic acid? (A)The nucleic acid is DNA and would be found in the cell’s nucleus. (B)The nucleic acid is DNA and would be found in the cytoplasm. (C)The nucleic acid is RNA and would be found in the cytoplasm. (D) nucleic acid is RNA and would be found in the cell’s nucleus. …?

The correct answer is A

The scientist can determine that this nucleic acid is a DNA molecule, because it contains Thymine, which does not occure in the RNA molecule. The RNA molecule contains Adenine, Guanine and Cytosine just like the DNA, but unlike the DNA it contains Uracil, not Thymine.

Secondly, the scientist can say with certainty that this DNA molecule is surrounded by a nucleus based on the structure of the nucleic acid described. Only eukaryotic cells have ladder structure. The prokaryotic cells have circular DNA and do not have any organelles, like the nucleus. Therefore, from the ladder structure of the DNA the scientist can see that the cell has a nucleus.

Posted in Biology

Determine how tRNA is used when cells build proteins …?

tRNA carries a single amino acid to the ribosome. 
It fits the codon on the mRNA in the ribosome with it’s anti-codon. 

The ribosome has peptidyl-transferase activity which catalyses the peptide bond between 2 amino acids on 2 tRNAs in the ribosome. 

One tRNA is released and then picks up another amino acid depending on its anti-codon.

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Mutagens such as pollutants and UV light can cause mutations in DNA to occur at a higher rate than normal. These mutations may be beneficial in some cases, but often they lead to cancer. Which of the following best describes how cancer cells affect the body? …? a. They cause the immune system to produce antibodies, which attack healthy cells along with the cancer cells. b. They consume normal cells and use them as fuel to reproduce and attack more healthy cells. c. They have an abnormally short cell cycle, and they die faster than the liver is able to remove them from the body. d. They take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.

Correct answer: D). They take nutrients needed by healthy cells, and as they grow they interfere with the function of normal cells and organs.

Cancer is uncontrolled growth of the cell in the body. The Old cell does not die and instead of that, they have grown out of control, which results in the formation of new abnormal cells. These may form a mass of tissue called a tumor.

Due to uncontrolled growth of a cell, the normal function of neighboring tissue or organ may be disturbed or it might damage vital organ such as kidney, heart, lung etc and may cause death.  

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18. The most prominent features of a narrow, V-shaped valley, where the stream profile drops rapidly, are _____. meanders and floodplains rapids and waterfalls lakes and ponds deltas and natural levees 18. The most prominent features of a narrow, V-shaped valley, where the stream profile drops rapidly, are _____. meanders and floodplains rapids and waterfalls lakes and ponds deltas and natural levees

The correct answer is rapids and waterfalls.  

Rapids refers to the segments of streams with extensively vigorous currents, various obstacles, and steps in their streambeds. A waterfall refers to a vertical drop in a stream bed. Both are the locations of vigorous erosion.  

The rapids are generally produced where the resilient bedrock limits a stream to a narrow channel and forces an enhancement in the velocity of water.  

On the other hand, waterfalls are produced where the fast-flowing water negotiates a geologic contact amid the more resilient and less resistant layers of rock, or through a fault, which has analogized distinct kinds of rocks. Or it can be said that waterfalls usually produce at the end of a series of rapids.  

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Time (hours) Number of Cells 0 200 .25 400 .5 800 .75 1600 1 3200 Write the rule of the function that gives the number of C cells at time t hours. C(t) = …?

I was thinking here of using the Monod Kinetics equation, however it seems that the given is lacking. So we will just use a first order growth kinetics since this is more commonly used. The derived first order kinetics for cell growth is

C = Co * e^(kt)

where

C = number of cells at any time
Co = initial number of cells
k = is the growth constant
t = time

in this case, Co is the number of cells at time t=0. The growth constant k is unknown. This can be obtained from the data given. We need to linearize the first order equation that is,

ln C = ln Co + kt

using the calculator or MS excel, obtain the slope (k) by plotting the ln (C) vs t. After doint that we can obtaine a k of 2.77 and therfore the equation is

C = 200*e^(2.77t)

Posted in Biology

What is an alternative future for cells when they reach their size limit? …?

An alternative future for cells when they reach their size limit are:

1. Divide, forming two smaller daughter cells. 
2. Become large by dint of becoming multinucleated, and flattening (slime mold) or becoming a “tube” (fungi) to maintain surface area to volume ratio. 

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When the gecko is a reptile that climbs on smooth surfaces such as glass using van see waals force to adhere to the surface. how is this method of adhesion more advantageous that covalent interactions?

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In physical chemistry, the van der Waals forces is the sum of the attractive or repulsive forces between molecules other than those due to covalent bonds or to the electrostatic interaction of ions with one another or with neutral molecules. Van der Waals forces are relatively weak compared to normal chemical bonds, but play a fundamental role in fields as diverse as supramolecular chemistry, structural biology, polymer science, nanotechnology, surface science, and condensed matter physics.

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