Q: Which of the following best describes the function of the Na\textsuperscript{+}/K\textsuperscript{+} ATPase in maintaining the resting membrane potential?

It pumps 3 Na\textsuperscript{+} out of the cell and 2 K\textsuperscript{+} into the cell, using ATP.

Q: Which of the following events occurs first during the generation of an action potential?

Opening of voltage-gated Na\textsuperscript{+} channels

Question 1

Which region of the neuron is primarily responsible for receiving synaptic input from other neurons?

Accepted Answer

Dendrites

Question 2

Which of the following best describes the function of the Na	extsuperscript{+}/K	extsuperscript{+} ATPase in maintaining the resting membrane potential?

Accepted Answer

It pumps 3 Na	extsuperscript{+} out of the cell and 2 K	extsuperscript{+} into the cell, using ATP.

Question 3

A neuron is exposed to a toxin that selectively blocks voltage-gated K	extsuperscript{+} channels. What is the most likely effect on the action potential?

Accepted Answer

Repolarization will be delayed, prolonging the action potential.

Question 4

Which of the following statements about graded potentials is TRUE?

Accepted Answer

They can be depolarizing or hyperpolarizing and decrease in magnitude with distance.

Question 5

During the absolute refractory period of an action potential:

Accepted Answer

No stimulus, regardless of strength, can initiate another action potential.

Question 6

Which of the following best explains why action potentials propagate in only one direction along an axon?

Accepted Answer

The refractory period prevents the action potential from re-initiating in the region just behind it.

Question 7

A patient with multiple sclerosis (MS) is experiencing muscle weakness. Which of the following best explains the physiological basis for this symptom?

Accepted Answer

Destruction of the myelin sheath slows or blocks action potential propagation along axons.

Question 8

Which of the following is a property unique to neurons compared to most other cells in the body?

Accepted Answer

Extreme longevity and high metabolic rate

Question 9

If the axon diameter of a neuron increases, what is the expected effect on the speed of action potential propagation?

Accepted Answer

It will increase.

Question 10

Which of the following best describes the difference between electrical and chemical synapses?

Accepted Answer

Electrical synapses allow direct current flow between cells, while chemical synapses rely on neurotransmitter release.

Question 11

A neuron receives two excitatory postsynaptic potentials (EPSPs) in rapid succession at the same synapse. This is an example of:

Accepted Answer

Temporal summation

Question 12

Which of the following events occurs first during the generation of an action potential?

Accepted Answer

Opening of voltage-gated Na	extsuperscript{+} channels

Question 13

Which of the following best describes the effect of an inhibitory postsynaptic potential (IPSP) on the postsynaptic neuron?

Accepted Answer

It hyperpolarizes the membrane, decreasing the likelihood of an action potential.

Question 14

Which of the following is NOT a way to terminate neurotransmitter action at a chemical synapse?

Accepted Answer

Continuous activation of postsynaptic receptors

Question 15

A neuron has a resting membrane potential of $$-70\ \mathrm{mV}. If $$the membrane becomes more negative, reaching $$-80\ \mathrm{mV}$$, this change is called:

Accepted Answer

Hyperpolarization

Question 16

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelin allows action potentials to jump between nodes of Ranvier via saltatory conduction.

Question 17

Which of the following statements about the all-or-none principle of action potentials is correct?

Accepted Answer

If threshold is reached, an action potential of fixed size is generated.

Question 18

A neuron is exposed to a drug that increases the permeability of the membrane to Na	extsuperscript{+} at rest. What is the most likely effect on the resting membrane potential?

Accepted Answer

The resting membrane potential will become less negative (depolarized).

Question 19

Which of the following best describes the role of the axon hillock in neural integration?

Accepted Answer

It is the site where EPSPs and IPSPs are integrated to determine if threshold is reached for an action potential.

Question 20

A patient is given a drug that blocks chemically-gated ion channels on the postsynaptic membrane. Which process will be directly affected?

Accepted Answer

Generation of postsynaptic potentials (EPSPs and IPSPs)

Physiology of Neurons – ANP1105 Topic 2.2 Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드