Question 1

The heart rate of a vertebrate will decrease in response to the arrival of ________.

Accepted Answer

A)   acetylcholine
B)   endorphin
C)   nitric oxide
D)   gamma-aminobutyric acid (GAB
A)

Question 2

An inhibitory postsynaptic potential (IPSP) occurs in a membrane made more permeable to ________.

Accepted Answer

A)   potassium ions
B)   sodium ions
C)   ATP
D)   all neurotransmitter molecules

Question 3

The amino acid that operates at most inhibitory synapses in the brain is ________.

Accepted Answer

A)   acetylcholine
B)   endorphin
C)   nitric oxide
D)   gamma-aminobutyric acid (GAB
A)

Question 4

The point of connection between two communicating neurons is called the ________.

Accepted Answer

A)   axon hillock
B)   dendrite
C)   synapse
D)   cell body

Question 5

Neurotransmitters can affect postsynaptic cells by ________.
I.initiating signal transduction pathways in the cells
II.causing molecular changes in the cells
III.altering ion channel proteins
IV.altering the permeability of the cells

Accepted Answer

A)   I and III
B)   II and IV
C)   III and IV
D)   I, II, III, and IV

Question 6

How could you increase the magnitude of excitatory postsynaptic potentials (EPSPs) generated at a synapse?

Accepted Answer

A)   Increase sodium-potassium pump activity.
B)   Increase K⁺ permeability.
C)   Increase Na⁺ permeability.
D)   All of the listed responses are correct.

Question 7

Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then ________.

Accepted Answer

A)   no action potential will be initiated
B)   an action potential will be initiated and proceed only in the normal direction toward the axon terminal
C)   an action potential will be initiated and proceed only back toward the axon hillock
D)   two action potentials will be initiated, one going toward the axon terminal and one going back toward the hillock

Question 8

Refer to the following graph of an action potential to answer the question.

The membrane potential is closest to the equilibrium potential for potassium at label ________.

Accepted Answer

A)   A
B)   B
C)   C
D)   D

Exam 48: Neurons, Synapses, and Signaling

The point of connection between two communicating neurons is called the ________.

Correct Answer
verified

Neurotransmitters can affect postsynaptic cells by ________. I.initiating signal transduction pathways in the cells II.causing molecular changes in the cells III.altering ion channel proteins IV.altering the permeability of the cells

Correct Answer
verified

The amino acid that operates at most inhibitory synapses in the brain is ________.

Correct Answer
verified

How could you increase the magnitude of excitatory postsynaptic potentials (EPSPs) generated at a synapse?

Correct Answer
verified

Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then ________.

Correct Answer
verified

An inhibitory postsynaptic potential (IPSP) occurs in a membrane made more permeable to ________.

Correct Answer
verified

Refer to the following graph of an action potential to answer the question. The membrane potential is closest to the equilibrium potential for potassium at label ________.

Correct Answer
verified

The heart rate of a vertebrate will decrease in response to the arrival of ________.

Correct Answer
verified

Exam 48: Neurons, Synapses, and Signaling

The point of connection between two communicating neurons is called the ________.

Correct AnswerverifiedShow Answer

Neurotransmitters can affect postsynaptic cells by ________. I.initiating signal transduction pathways in the cells II.causing molecular changes in the cells III.altering ion channel proteins IV.altering the permeability of the cells

Correct AnswerverifiedShow Answer

The amino acid that operates at most inhibitory synapses in the brain is ________.

Correct AnswerverifiedShow Answer

How could you increase the magnitude of excitatory postsynaptic potentials (EPSPs) generated at a synapse?

Correct AnswerverifiedShow Answer

Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then ________.

Correct AnswerverifiedShow Answer

An inhibitory postsynaptic potential (IPSP) occurs in a membrane made more permeable to ________.

Correct AnswerverifiedShow Answer

Refer to the following graph of an action potential to answer the question. The membrane potential is closest to the equilibrium potential for potassium at label ________.

Correct AnswerverifiedShow Answer

The heart rate of a vertebrate will decrease in response to the arrival of ________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified