A&P-Chp 19-Bank comprehensive Questions and
Answers with 100% Correct Answers | Latest Version
Question 1.
Which is true of a neuron with a resting potential? a. The cell membrane is permeable to
Na+ but impermeable to K+ ions. b. The outer surface of the plasma membrane has a
negative charge. c. The highest concentration of K+ is extracellular. d. The sodium pump
has moved Na+ to the outside of the plasma membrane.
Correct Answer: d. The sodium pump has moved Na+ to the outside of the plasma
membrane.
Question 2.
The first event to occur when an adequate stimulus is applied to a neuron is: a. the
membrane potential moves immediately to a value of +30 mV. b. the potassium channels
open. c. the sodium channels are inactivated. d. some of the sodium channels at the point of
stimulation open.
Correct Answer: d. some of the sodium channels at the point of stimulation open.
Question 3.
Which is true of an action potential? a. The plasma membrane is impermeable to Na+ and
K+ ions. b. Na+ ions move extracellularly. c. The charges become equal on the outside and
inside of the plasma membrane. d. The outside of the plasma membrane is negatively
charged, and the inside is positively charged
Correct Answer: d. The outside of the plasma membrane is negatively charged, and
the inside is positively charged
Question 4.
The only ion(s) that can diffuse across a neuron's membrane when the neuron is at rest
is(are): a. sodium. b. potassium. c. proteins. d. phosphate.
Correct Answer: b. potassium.
Question 5.
A slight shift away from the resting membrane potentials in a specific region of the plasma
membrane is called a _____ potential. a. membrane b. resting membrane c. local d. None of
the above is correct.
Correct Answer: c. local
, Question 6.
During a relative refractory period: a. the action potential cannot be initiated. b. a resting
potential exists. c. the cell membrane is impermeable to Na+ and K+. d. the action potential
can be initiated with a strong stimulus.
Correct Answer: d. the action potential can be initiated with a strong stimulus.
Question 7.
Within the nervous system, coding for the strength of a stimulus is accomplished through: a.
changes in the magnitude of the action potential. b. changes in the length or duration of the
action potential. c. the frequency of nerve impulses. d. an increase in the number of opening
sodium channels.
Correct Answer: c. the frequency of nerve impulses.
Question 8.
The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters
per second. a. 60 b. 85 c. 130 d. 190
Correct Answer: c. 130
Question 9.
A synapse consists of: a. a synaptic knob. b. a synaptic cleft. c. the plasma membrane of a
postsynaptic neuron. d. all of the above.
Correct Answer: d. all of the above.
Question 10.
A synaptic knob would be located on a(n): a. cell body. b. axon. c. dendrite. d. cell body,
axon, or dendrite.
Correct Answer: b. axon.
Question 11.
When an impulse reaches a synapse: a. two nerve fibers come in direct contact. b. impulses
will pass in either direction. c. an electrical spark will jump the gap. d. chemical transmitters
are released
Correct Answer: d. chemical transmitters are released
Question 12.
Excitatory neurotransmitters are most likely to: a. increase the speed of impulse conduction.
b. make the cell membrane impermeable. c. initiate an action potential. d. make the resting
potential more negative.
Correct Answer: c. initiate an action potential.
Answers with 100% Correct Answers | Latest Version
Question 1.
Which is true of a neuron with a resting potential? a. The cell membrane is permeable to
Na+ but impermeable to K+ ions. b. The outer surface of the plasma membrane has a
negative charge. c. The highest concentration of K+ is extracellular. d. The sodium pump
has moved Na+ to the outside of the plasma membrane.
Correct Answer: d. The sodium pump has moved Na+ to the outside of the plasma
membrane.
Question 2.
The first event to occur when an adequate stimulus is applied to a neuron is: a. the
membrane potential moves immediately to a value of +30 mV. b. the potassium channels
open. c. the sodium channels are inactivated. d. some of the sodium channels at the point of
stimulation open.
Correct Answer: d. some of the sodium channels at the point of stimulation open.
Question 3.
Which is true of an action potential? a. The plasma membrane is impermeable to Na+ and
K+ ions. b. Na+ ions move extracellularly. c. The charges become equal on the outside and
inside of the plasma membrane. d. The outside of the plasma membrane is negatively
charged, and the inside is positively charged
Correct Answer: d. The outside of the plasma membrane is negatively charged, and
the inside is positively charged
Question 4.
The only ion(s) that can diffuse across a neuron's membrane when the neuron is at rest
is(are): a. sodium. b. potassium. c. proteins. d. phosphate.
Correct Answer: b. potassium.
Question 5.
A slight shift away from the resting membrane potentials in a specific region of the plasma
membrane is called a _____ potential. a. membrane b. resting membrane c. local d. None of
the above is correct.
Correct Answer: c. local
, Question 6.
During a relative refractory period: a. the action potential cannot be initiated. b. a resting
potential exists. c. the cell membrane is impermeable to Na+ and K+. d. the action potential
can be initiated with a strong stimulus.
Correct Answer: d. the action potential can be initiated with a strong stimulus.
Question 7.
Within the nervous system, coding for the strength of a stimulus is accomplished through: a.
changes in the magnitude of the action potential. b. changes in the length or duration of the
action potential. c. the frequency of nerve impulses. d. an increase in the number of opening
sodium channels.
Correct Answer: c. the frequency of nerve impulses.
Question 8.
The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters
per second. a. 60 b. 85 c. 130 d. 190
Correct Answer: c. 130
Question 9.
A synapse consists of: a. a synaptic knob. b. a synaptic cleft. c. the plasma membrane of a
postsynaptic neuron. d. all of the above.
Correct Answer: d. all of the above.
Question 10.
A synaptic knob would be located on a(n): a. cell body. b. axon. c. dendrite. d. cell body,
axon, or dendrite.
Correct Answer: b. axon.
Question 11.
When an impulse reaches a synapse: a. two nerve fibers come in direct contact. b. impulses
will pass in either direction. c. an electrical spark will jump the gap. d. chemical transmitters
are released
Correct Answer: d. chemical transmitters are released
Question 12.
Excitatory neurotransmitters are most likely to: a. increase the speed of impulse conduction.
b. make the cell membrane impermeable. c. initiate an action potential. d. make the resting
potential more negative.
Correct Answer: c. initiate an action potential.
