Question

11. Assume that pre-synaptic neuron X is now repetitively stimulated very rapidly, what changes would you expect to occur in the post-synaptic membrane?

a. Temporal summation of the post-synaptic potentials

b. Spatial summation of the post-synaptic potential

c. The membrane potential changes in the post-synaptic membrane will cancel each other out because the post-synaptic membrane is refractory form the first post-synaptic potential

12. The amount of time between action potentials is determined by:

a. The all-or-none properties of the graded potential at axon hillock

b. The source of the graded potential at the axon hillock

c. The amplitude (size) of the graded potential at the axon hillock

13. Which of these synapses does NOT have acetylcholine as its primary transmitter?

a. Synapse of post ganglionic parasympathetic neuron onto the heart cell

b. Synapse of postganglionic sympathetic neuron onto a smooth muscle cell

c. Synapse preganglionic sympathetic neuron onto a postganglionic neuron

d. Synapse of a somatic efferent neuron onto a skeletal muscle cell

14. Parasympathetic ganglia are generally located:

a. In a chain parallel to the spinal cord

b. In the dorsal roots of spinal nerves

c. Next to or within the organs innervated

d. In the brain

Answer 1