The part of the nerve cell in which the nucleus is located is the
A) dendrites.
B) cell body.
C) axon.
D) neuroglia.
E) neuron.
Ans: B) cell body.
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When sodium channels open during an action potential, the opening is caused by
A) binding of sodium ions. B) presence of positive charge. C) presence of calcium. D) binding of potassium ions.
If an electrical synapse conducted an action potential "backward" (from what would normally be the postsynaptic neuron to the presynaptic neuron), would an action potential be conducted in a retrograde direction (along the axon toward the cell body)?
a. Yes. b. No, since the normally presynaptic neuron lacks receptors for the ions carrying current from the normally postsynaptic neuron. c. No, since the normally presynaptic neuron would be refractory to retrograde conduction. d. No, unless the concentration gradients for all the relevant ions were reversed. e. No, since there's no axon hillock at the axon terminal of the normally presynaptic neuron.
Ascites, the accumulation of fluid in the peritoneal cavity, would not be caused by
A) liver disease. B) cancer. C) kidney disease. D) dehydration. E) heart failure.
Which one of the following would indicate a dentalized [s] production?
a) [ ] b) [s:] c) [ ] d) [ ]