12) Chemical neural synapses are characterized by all of the following except A)

Question

12) Chemical neural synapses are characterized by all of the following except

A) CA ions flowing from the postsynaptic to the presynaptic membrane

B) the release of neurotransmitter by the presynaptic membrane

C)postsynaptic membranes with chemically gated ion channels

D) voltage gated Ca channels on the presynaptic membrane

13) the speed of action potential conduction (=propagation) is slowest in

a)myelinated, large diameter fibers

b)myelinated, small diameter fibers

c)unmyelinated, large diameter fibers

d)unmyelinated, small diameter fibers

Explanation / Answer

12. The synapses in the neurons does the following functions like release of neurotransmitter by presynaptic neuron, postsynaptic neurons acquiring the neurotransmitters by chemical gated ion channels and voltage gated calcium channels on presynaptic membrane release the neurotransmitters.

The function which is not characterized by the neural synapses is Calcium ions flowing from postsynaptic to the presynaptic membrane.

14. The conduction of action is via saltatory conduction in myelinated axons, where they travel between the unwrapped spaces between the adjacent cells which are called as node of ranvier. Myelin sheath prevents sodium ions from crossing the membrane and causing the action potential.

The action potential is slowest in unmyelinated and small diameter fibers.

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