Hole's Human Anatomy & Physiology (Shier), 12th Edition

Ph.I.L.S. 3.0 Quizzing 25: Ph.I.L.S. 3.0 Quizzing

Ph.I.L.S. 3.0 Quizzing

1
Look at your data. Is there a relationship between the amplitude of the two EPSPs?
A)If the first EPSP was small the second exhibited facilitation (i.e. EPSP #2 was larger).
B)If the first EPSP was small the second exhibited depression (i.e. EPSP #2 was smaller).
C)Pairs of EPSPs were the same size.
2
Looking at responses that showed synaptic facilitation, where EPSP #2 was larger. Was EPSP #2 produced by secretion of:
A)fewer synaptic vesicles than EPSP #1.
B)the same number of synaptic vesicles than EPSP #1.
C)more synaptic vesicles than EPSP #1.
3
Synaptic facilitation is produced by a higher concentration of calcium in the terminal during the second response. The calcium concentration is higher because:
A)more calcium channels are opened by the second presynaptic action potential.
B)more calcium enters the terminal during the second presynaptic action potential.
C)some calcium remains in the terminal from the first presynaptic action potential, and this residual calcium adds to the calcium that enters during the second presynaptic action potential.
4
Calcium enters the terminal to initiate vesicle release and then is slowly removed. If EPSPs were produced at a closer interval there would e more residual calcium, so:
A)the second action potential would release more vesicles.
B)the second action potential would release the same number of vesicles.
C)the second action potential would release fewer vesicles.
5
Look at your data. Is there a relationship between the amplitude of the two EPSPs?
A)If the first EPSP was large the second exhibited facilitation (i.e. EPSP #2 was larger).
B)If the first EPSP was large the second exhibited depression (i.e. EPSP #2 was smaller).
C)Pairs of EPSPs were the same size.
6
If all other variables remain constant, when two action potentials enter the synaptic terminal and produce a pair of EPSPs in the muscle fiber, the larger EPSP is produce by the secretion of:
A)fewer synaptic vesicles.
B)the same number of synaptic vesicles.
C)more synaptic vesicles.
7
In a chemical synapse that exhibits depression, which response is produced by the secretion of more synaptic vesicles?
A)(the larger) EPSP #1.
B)(the smaller) EPSP #2.
C)neither, both EPSPs are produced by the secretion of the same number of vesicles.
8
Look at your data. When compared with synapses that exhibit facilitation, synapses that show depression have larger EPSP #1 because:
A)the response is produced by the release of substantially more synaptic vesicles.
B)the response is produced by the release of about the same number of synaptic vesicles.
C)the response is produced by the release of substantially fewer synaptic vesicles.
D)response amplitude is not associated with the number of synaptic vesicles released.
9
During synaptic depression, the first action potential releases a large number of synaptic vesicles to produce EPSP #1. At this point:
A)the level of calcium in the terminal is at resting levels.
B)the number of vesicles available for release is reduced.
C)calcium channels can not open to allow more calcium into the terminal.
10
During synaptic depression the second EPSP is smaller than the first because:
A)the number of vesicles available for release is smaller than for EPSP #1.
B)there has been insufficient time to replenish the vesicles released to produce EPSP #1.
C)the level of calcium in the terminal is greater than for EPSP #1, but fewer vesicles are released.
D)all of the above statements are true.
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