Sorry, I need the answer in 1.5 hours. Hope you can help me out within this limited time. I can raise up the price if thats needed. 1) Which of the following is true? a. At the site of an action pote

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Sorry, I need the answer in 1.5 hours. Hope you can help me out within this limited time. I can raise up the price if thats needed.

1) Which of the following is true?a. At the site of an action potential the cytoplasmic [Na+] briefly becomes higher than the [K+].b. An excitatory post-synaptic potential makes the post-synaptic membrane more depolarized.c. At the resting potential the driving force on K+ is greater than on Na+d. Inhibitory post-synaptic potentials can hyperpolarize the membranes by allowing K+ to flow into the cell.e. More than one of the choices are true.

2) Which of the following statements is not true?a. Nervous stimulation of skeletal muscle is always excitatory, whereas nervous stimulation of smooth muscle may be excitatory or inhibitory.b. The rising phase of an action potential is caused by different ions in skeletal vs smooth muscles.c. Smooth muscle cells can contract in the absence of any nervous stimulation.d. In the absence of neural input, skeletal muscle cannot generate tension.e. All of the choices are true.

3) A hypothetical cell is only permeable to K+. It has higher [KCl] concentration inside than out, and has a K+ equilibrium potential (VK+) of -90 mV.  If the concentration of ions is kept constant, but the membrane potential is set to -100 mV, what will be the resulting current?a. Cl- will flow outb. Cl- will flow inc. K+ will flow outd. K+ will flow ine. Cl- will flow in and K+ will flow in

4) All homeostatic systems require an integrator. The purpose of the integrator is to:a. sense the homeostatic parameter that is being maintained.b. compare the actual homeostatic parameter to the set point.c. bring about the necessary change to restore the set point.d. determine the homeostatic set point.e. Two of the choices are correct

5) Which of the following statements about different kinds of skeletal-muscle fibers is true?

I. Oxidative fibers have a greater abundance of glycogen than do glycolytic fibers.

II. Glycolytic fibers have a greater abundance of myoglobin than do oxidative fibers.

III. Glycolytic fibers can generate greater tension than oxidative fibers.

a. Only I is true

b. Only II is true

c. Only III is true

d. Both I and III are true

e. I, II, and III are true

6) Which of the following is FALSE between primary and secondary active transport?a. Primary active transport uses a carrier that is phosphorylated whereas the latter does not.b. Primary active transport uses a carrier that is an ATPase whereas the latter does not.c. The driving force for primary active transport comes from ATP hydrolysis whereas it is not in secondary active transport.d. Primary active transport uses a carrier whose binding affinity for the solute is modified by conformational changes whereas the latter does not.e. All the statements are true.

7) An increase in the extracellular concentration of K+ above normal (in a neuron) would result in

a. A decrease in intracellular K+b. Hyperpolarization of resting nerve cellsc. An increase in intracellular Na+ d. The resting membrane potential moving closer to threshold.e. No change in intracellular ion concentrations

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