A neuron which exhibits saltatory conduction differs from on that does not, in that the former

1. A neuron which exhibits saltatory conduction differs from on that does not, in that the former
a. produces its action potentials through a Na+ ion influx
b. produces its action potentials through a K+ influx
c. produces action potentials only at the nodes of Ranvier
d. has a slower conduction velocity
e. requires a greater diameter axon.

2. With respect to neurotransmitters
a. the opening of calcium gates in the terminals of the axons in response to action potentials is involved in transmitter release.
b. acetylcholine can interact with both muscarinic and nicotinic receptors.
c. norepinephrine can interact with both alpha and beta adrenergic receptors
d. they can include serotonin, nitric oxide, glutamate, nitric oxide
e. all of the above.

3.Which of these are NOT characteristics of action potentials?
a. they are produced by voltage regulated gates
b. they are conducted without decrement
c. sodium and potassium gates open at the same time
d. the membrane potential reverses polarity durind depolarization
e they all have the same amplitude


4. Which of these is NOT a characteristic of synaptic potentials?
a. they are all or none in amplitude
b. they decrease in amplitude with distance
c. they are produced in dendrites and cell bodies
d. they are graded in amplitude
e they are produced by chemically regulated gates

5. Neostigmine is an inhibitor of acetylcholine esterase. When a potential is measured from a postsynaptic membrane in the presence of neostigmine,
a. there will be no effect of neostigmine on the postsynaptic membane
b. the amplitude of the potential of the postsyanptic membrane will increase
c. the duration of the potential of the postsynaptic membrane will increase
d. the postsynaptic potential will disappear, since synaptic transmission can no longer occur
e. the postsynaptic membrane will become hyperpolarized instead of depolarizing

6. Which of the following statements regarding the spinal cord is true?
a. sensory fibers enter the spinal cord at the ventral horn
b. the white matter is found on the inside
c. motor fibers enter the spinal cord at the dorsal horn
d. the sensory fibers enter the spinal cord at the dorsal horn
e. none of the above statements are true.

7. The absolute refractory period of a neuron
a. is due to the high negative polarity of the inside of the neuron
b. occurs only during the repolarization phase
c. occurs only during the depolarization phase
d. occurs during the depolarization and the first part of the repolarization phase
e. occurs during the hyperpolarization phase