1. Which of the following statements concerning propagation of action potentials
ID: 203661 • Letter: 1
Question
1. Which of the following statements concerning propagation of action potentials is incorrect?
a) Saltatory conduction occurs in myelinated nerve fibers.
b) During conduction by local current flow, there is a flow of current between the active and adjacent inactive area of the cell membrane, thereby decreasing the potential in the inactive area to threshold.
c) The action potential jumps from one Schwann cell to the adjacent Schwann cell in a myelinated fiber.
d) Saltatory conduction is faster than conduction by local current flow.
e) Conduction by local current flow is the method of propagation in unmyelinated fibers.
2. During the _____, there is no response to a stimulus of normal threshold magnitude, but a neuron can respond to a second stimulus of higher magnitude.
a. Absolute refractory period
b. Spacial refractory period
c. Relative refractory period
d. Temporal refractory period
e. None of the above
3. Which is NOT a common step in process of receptor-mediated endocytosis?
a. Hormones bind to receptor
b. Hormone-receptor complex is taken into the cell via endocytosis
c. Hormone is separated from the receptor and ultimately activates genetic systems of the cell leading to a cellular response(s).
d. Hormone is recycled back into the cell membrane
4. A potential problem for hormone transport in the blood may be its small size and or its low solubility in the blood.
a. True
b. False
5. Which of the following is NOT a characteristic of synaptic potentials (either EPSP’s or IPSP’s)?
a. They are graded in amplitude
b. They decrease in amplitude with distance
c. They are produced by chemically regulated gates
d. They follow the “all or none” principle
Explanation / Answer
1.c.The action potential jumps from one Schwann cell to the adjacent Schwann cell in a myelinated fiber.
2.c. Relative refractory period.
3.d. Hormone is recycled back into the cell membrane
4.a. True
5.d. They follow the “all or none” principle
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