검증된 단계별 안내
02:02
03:53
2:30Which of the following is not a method by which the effects of neurotransmitters are terminated?
a. Reuptake into the presynaptic neuron
b. Diffusion away from the synaptic cleft and uptake by glial cells
c. Movement back to the cell body by retrograde axonal transport
d. Degradation by enzymes in the synaptic cleft
Identify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B).
a. ______ The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions.
b. ______ Transmission is unidirectional and delayed.
c. ______ A presynaptic neuron and a postsynaptic neuron are involved.
d. ______ The use of neurotransmitters packaged into synaptic vesicles is required.
e. ______ Transmission is nearly instantaneous and bidirectional.
The ________ is the period of time during which it is impossible to stimulate a neuron to have an action potential, whereas the ________ is the period of time during which a larger-than-normal stimulus is required to elicit an action potential.
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The Na+/K+ pumps and gated channels maintain the Na+ and K+ gradients necessary for action potentials to occur.
A ________ is characterized by multiple input neurons synapsing on one postsynaptic neuron.
a. Diverging circuit
b. Discharge zone
c. Facilitation zone
d. Converging circuit
Which of the following statements best describes saltatory conduction?
a. Every section of the axolemma must be depolarized and triggered to generate an action potential.
b. The internodes must generate action potentials.
c. The dendrites and cell bodies propagate EPSPs toward the trigger zone.
d. Only the nodes of Ranvier must generate action potentials.
