11. Neurons whose cell bodies are located in the right precentral gyrus cross ov

Question

11. Neurons whose cell bodies are located in the right precentral gyrus cross over to the left side of the body in the:

a. ventral spinal cord.
b. dorsal column nuclei
c. decussation of the pyramids d. internal capsule
e. a and b are correct

12. Potentials initiated in a 5-centimeter long neuron that contains only passive membrane would:

a. remain unchanged along the entire length of the neuron.
b. initiate an action potential.
c. reinitiate themselves every few millimeters.

d. normally dissipate within a few millimeters of the site of their initiation.

e. reach threshold within a few millimeters of the site of their initiation.

8. In skeletal muscle, the sarcoplasmic reticulum serves to:
a. release calcium into the sarcoplasm to initiate muscle contraction.

b. pump calcium from the sarcoplasm to cause the muscle to relax.

c. conduct action potentials into the middle of the muscle.
d. open voltage-gated channels in the sarcolemma.
e. a and b are correct.

9. Movement of bone by skeletal muscle requires mechanical connections between the contracting muscle fibrils and the bone. Of these mechanical connections, which of the following is (are) intracellular structures?

a. epimysium.
b. endomysim.
c. perimysium.
d. -actinin forming z-lines
e. all of the above are intracellular structures

Explanation / Answer

11. ( A) ventral spinal cord

12. ( D) normally dissapate with in a few milli meters of the site of their initiation

8.( A )  release calcium into the sarcoplasm to initiate muscle contraction.

9. ( A ) epimysium  

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