Fever is caused by
A) increased blood flow to the brain.
B) the release of histamine by damaged cells.
C) the effect of pyrogens on the hypothalamus.
D) decreased white blood cell count in the bloodstream.
C
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If you touch a hot stove and burn your hand, the pain isn't actually in your hand-it's in your head. What evidence can you provide to substantiate this claim?
A. Interneurons form connections directly from the burned receptor molecules to the brain. B. Motor neurons pull your hand away from the flame, signaling pain to the brain. C. Sensory neurons and interneurons carry the heat sensation to the brain where it is interpreted as painful. D. A reflex arc allows the quick response between the hand and the brain; no interpretation occurs.
Radioactive isotopes are biological tools that are often used to
A) measure the size of fossils. B) build up a store of calcium in a cell. C) detect brain tumors and other important medical technologies. D) increase the pH of blood.
Which statement concerning gamete production is correct?
A) Progestins stimulate development of new follicles. B) Sperm cells can be produced only at certain points in the reproductive cycle. C) The number of sperm a man can produce is essentially unlimited, whereas the number of eggs a woman can potentially produce is limited. D) A man is born with all of the sperm he will need for the rest of his life.
You're examining the structure of a newly discovered protein, and you see that it includes lots of a-helices and B-pleated sheet. Your specific observations are of the ______________ structure of the protein, and are the direct results of _____________?
Fill in the blank(s) with the appropriate word(s).