Saltatory conduction of an action potential means that
A. once one action potential is created, it moves down the axon.
B. the whole axon depolarizes at the same time.
C. one action potential stimulates the production of a new action potential at the adjacent site.
D. an action potential is conducted from one node of Ranvier to the next node.
D
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The dip of the meningeal layer of the dura mater into the transverse fissure is the _________________________.
Fill in the blank(s) with the appropriate word(s).
Thyroid stimulating hormone (TSH) is produced by the ________
A) thyroid gland B) hypothalamus C) anterior pituitary D) posterior pituitary
Which of the following characteristics is NOT true for a hormone?
A. It is a chemical substance that circulates through the body to influence the body's processes. B. It may be a messenger secreted by one gland to influence the secretion of another gland. C. The body works best with hormones; however, can function without them, if needed. D. Hormones are regulated by a negative feedback system.
Which condition is a degenerative disorder of the brain characterized by tremors and slow, uncoordinated movements?
A. Alzheimer's disease B. Cerebrovascular accident C. Huntington's disease D. Parkinson's disease