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
Scroll through your data in the Journal. What was the lowest shock voltage that produced an EPSP in any of the impaled muscle fibers?
A)0.2 volts.
B)0.4 volts.
C)0.6 volts.
D)0.7 volts.
2
The motor axon with the lowest threshold required a shock of 0.4 volts to produce an action potential. The amplitude of the EPSP in the fibers supplied by this axon:
A)always produced an action potential.
B)was the same.
C)varied from fiber to fiber.
3
The motor neuron that produced an action potential in response to a 0.4 volt shock did not produce an EPSP in some muscle fibers. This can be explained by:
A)the motor neuron does not make a synaptic connection with those muscle fibers.
B)the EPSP is very small and can not be seen.
C)the motor neuron did not always produce an action potential at that shock voltage.
4
In some fibers, the EPSP increased in size (or appeared if there was no response at 0.4 volts) when the shock voltage was:
A)0.5 volts.
B)0.7 volts.
C)1.0 volt.
D)1.2 volts.
5
In some fibers, the 0.7 volt shock increased the size of the EPSP. This increase in EPSP amplitude is due to:
A)an action potential in a second motor axon.
B)a larger action potential in the first motor axon.
C)a burst of action potentials in the first motor axon.
6
In some fibers, the EPSP increased in size (or appeared if there was no response at 0.7 volts, or even produced an action potential) when the shock voltage was:
A)0.5 volts.
B)0.8 volts.
C)0.9 volts.
D)1.0 volt.
7
If a muscle fiber showed a change in EPSP amplitude at 0.4 volts, 0.7 volts, and 0.9 volts. This suggests that the impaled muscle fiber is supplied by:
A)no motor axons.
B)1 motor axon.
C)2 motor axons.
D)3 motor axons.
8
In some fibers, the EPSP increased in size (or appeared if there was no response at 0.9 volts, or even produced an action potential) when the shock voltage was:
A)1.0 volt.
B)1.1 volts.
C)1.3 volts.
D)1.5 volts.
9
A muscle fiber produces an action potential at a shock voltage of 0.9 volts. Can you tell whether that muscle fiber is supplied by the motor axon that is stimulated by a 1.1 volt shock?
A)Yes; the action potential will get bigger
B)No; the action potential will not be affected by the spatial summation created by the last motor neuron.
C)Yes; the action potential will be replaced by a large EPSP.
10
Increasing the shock voltage produced an action potential in more motor axons. The EPSPs showed spatial summation as more motor axons were recruited so that the EPSP:
A)decreased in amplitude as more axons that supplied the impaled fiber produced an action potential.
B)did not change its amplitude.
C)increased in amplitude as more axons that supplied the impaled fiber produced an action potential.
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