PCQ9

Question 1

hyperpolarization

Answer 1

some K+ channels remain open, and Na+ channels rest

Question 2

threshold stimulus

Answer 2

any stimulus at or above this level will result in action potential

Question 3

repolarization

Answer 3

Na+ channels are inactivating, and voltage-gated K+ channels open

Question 4

depolarization

Answer 4

voltage-gated Na+ channels open

Question 5

secretory zone

Answer 5

axon terminals release neurotransmitters

Question 6

receptive region

Answer 6

receives stimuli

Question 7

trigger zone

Answer 7

area where nerve impulse is generated

Question 8

secretory region

Answer 8

plasma membrane exhibits voltage-gated Ca2+ channels

Question 9

conducting region

Answer 9

plasma membrane exhibits voltage-gated Na+ and K+ channels

Question 10

parallel after-discharge circuit

Answer 10

may be involved in complex, exacting types of mental processing

Question 11

converging circuit

Answer 11

different types of sensory input can have the same ultimate effect

Question 12

diverging circuit

Answer 12

one incoming axon triggers responses in ever-increasing numbers farther and farther along circuit

Question 13

reverberating circuit

Answer 13

involved in activating fibers of a skeletal muscle such as the biceps

Question 14

Reflexes are rapid, automatic responses to stimuli that will produce the same effect every time.

Answer 14

True

Question 15

During depolarization, the inside of the neuron’s membrane becomes less negative.

Answer 15

True

Question 16

Strong stimuli cause the amplitude of action potentials generated to increase

Answer 16

False

Question 17

The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.

Answer 17

False