What effect does smoking have on the movement of mucus in the respiratory tract?
What will be an ideal response?
Smoke paralyzes the cilia so that the mucus cannot be swept upward.
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Leaching is caused by
a. bacterial action. b. wind. c. water. d. microbial activity. e. none of these.
A system with two separate circuits is indicated by
a. A. b. B. c. C. d. all of these. e. none of these.
The net reproductive rate is the sum of what column?
A) lxbx B) bx C) lx D) x
Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition?
A) a local accumulation of growth-inhibiting factors B) cells' innate ability to "sense" when the organ of which they are a part has no need for additional cells C) a local deficiency of nutrients D) physical contact of cell-surface proteins between adjacent cells