Tetrodotoxin is a toxin that blocks voltage -gated sodium channels. What effect does this substance have on the function of neurons?
A) The absolute refractory period is shorter than normal.
B) The toxin does not interfere with neuron function because the voltage -regulated sodium channels would still function.
C) The neuron is not able to propagate action potentials.
D) Neurons depolarize more rapidly.
E) Action potentials lack a repolarization phase.
C) The neuron is not able to propagate action potentials.
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a. black, red, and white b. blue, green, and red c. blue, green, and white d. green, orange, and yellow e. orange, yellow, and white
Which of the following muscles attaches to the clavicle?
A. Sternohyoid B. Omohyoid C. Geniohyoid D. Digastric
Glial cells that surround the neurons in ganglia are
A) astrocytes. B) satellite cells. C) oligodendrocytes. D) microglia. E) ependymal cells.
Damage to the muscle called the levator ani would result in
A. difficult defecation. B. decreased support for the pelvic viscera. C. Both "difficult defecation" and "decreased support for the pelvic viscera" are correct. D. inability of a male to have an erection. E. difficult urination.