The respiratory center is most likely to increase the breathing rate if the
A. pH of body fluids is decreasing.
B. pH of body fluids is increasing.
C. concentration of carbonic acid is decreasing.
D. concentration of sodium bicarbonate is increasing.
Answer: A
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A difference between mucous membranes and serous membranes is
A) whether the cavity is open to the exterior or not. B) the amount of blood vessels lining the cavity wall. C) whether the tissue is epithelial or connective. D) the density of collagen fibers in the cavity wall. E) whether the membrane is thick or thin.
Blood flow to the skin ________
A) is not an important source of nutrients and oxygen for skin cells B) is controlled mainly by decreasing pH C) increases when environmental temperature rises D) increases when body temperature drops so that the skin does not freeze
The ________ muscles adjust the shape and thickness of the lens
Fill in the blank(s) with correct word
Immature, undifferentiated bone cells are called
A. osteoclasts. B. osteoprogenitor cells. C. osteocytes.