Please answer these questions and please explain in details.
1- If you increase the extracellular concentration of Na+ ions,what effect would this have on the various steps of an actionpotential?
2- If you increase the extracellular concentration of K+ ions,what effect would this have on the various steps of an actionpotential?
3- Which of the following changes (or effects ofdrugs/poison/venom) at the synapse would decrease/increase themagnitude of graded potentials generated on the on the postsynaptic cell?
Please answer these questions and please explain in details.
1- If you increase the extracellular concentration of Na+ ions,what effect would this have on the various steps of an actionpotential?
2- If you increase the extracellular concentration of K+ ions,what effect would this have on the various steps of an actionpotential?
3- Which of the following changes (or effects ofdrugs/poison/venom) at the synapse would decrease/increase themagnitude of graded potentials generated on the on the postsynaptic cell?
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Cellular biology answer check. please check if my answers arecorrect or not.
1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)
2) Membrane transport proteins...
a)...transport membrane potentials between cells |
b) | ...transport membranes from the ER to the Golgi |
c) | ...are made up of phospholipids |
d) | ...transport molecules across membranes |
i chose d
3)The electrochemical gradienttakes into account:
a) | The concentration of solutes on either side of themembrane. |
b) | The overall charge on either side of the membrane. |
c) | Both of these. |
i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)
4) If no energywere expended by an animal cell:
a) | Both gradients would be depleted |
b)The K+ gradient would maintain itself. |
c) | None of these |
d) | The Na+ gradient would maintain itself. |
I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.
5) Which of the following is a true statement aboutactin?
a) | Once actin has polymerized, it never depolymerizes. |
b) | Actin is a transmembrane protein. |
c) | Actin can form branched networks. |
d) | Actin filaments are organized into hollow tubes. |
I chose c. can't explain why.
6)Ion channels:
a) | Form a hydrophobic channel through the membrane |
b) | Have filters that let sugars through |
c) | Are selective for particular ions (only the |
Which of the following statements is TRUE regarding sea anemones? | |||||||||||
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2. | Some people have low levels of calcium circulating in the blood, a condition known as hypocalcemia. While for many this disorder has little to no effect, for some it can be life-threatening. How could low levels of calcium harm an individual? | ||||||
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3. | Cephalization is: the | ||||||||
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4. | Which of the following are TRUE about the resting membrane potential? (Select all that apply.) | ||||||
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5. | Afferent and efferent neurons differ in: | ||||||
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6. | A neuron that responds to the environment is a(n): | ||||||||
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7. | Which of the following is NOT the role of an interneuron? | ||||||||
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8. | Where are postsynaptic cell receptor proteins synthesized? | ||||||||
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9. | Inhibition of the flexor muscle during the knee-extension reflex is an example of: | ||||||||
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10. | What type of cells produce myelin for sensory neurons? | ||||||||
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