Why is the hand region of the homunculus on the precentral gyrus so large?
A. Our arms require a lot of muscle control.
B. The hand is a proportionally large part of the body.
C. We have a lot of motor units associated with finger movement.
D. We have very sensitive fingertips.
E. We have very mobile wrists.
Answer: C
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If a hole is torn in a cell's plasma membrane, the cell will die because
A) it will not be able to maintain differences between the cytoplasm and extracellular fluid. B) germs are attracted toward cytoplasm leaking from a cell. C) it will not be able to undergo cell division. D) its chromosomes will not be held in place. E) cells can only make more plasma membrane during cell division.
Cells that stay in the body and make it easier to fight off an infection the second time you get it are called
A) helper cells. B) memory cells. C) macrophages. D) suppressor cells. E) None of the answers are correct.
The combining form for pregnant is:
A) gravid/o B) par/a C) par/o D) grav/e
Many factors modify metabolic rate. Which one increases metabolic activity?
A) increasing exercise B) aging C) hypothermia (lowered body temperature) D) obesity