How does keratin in skin help defend the body?
A. It traps microbes.
B. It is a tough protein that bacteria cannot easily break through.
C. It forms an acid mantle which bacteria do not like.
D. None of these answers are correct.
Answer: B
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Cardiac muscle, smooth muscle, most exocrine glands, some endocrine glands, and adipose tissue are innervated by the autonomic nervous system, the involuntary branch of the peripheral efferent division
a. True b. False Indicate whether the statement is true or false
Monocytes differentiate into large phagocytic cells
Indicate whether the statement is true or false
In emphysema, all of the following occur except
A) alveoli collapse. B) compliance increases. C) there is elevated PCO2 in the blood. D) the surface area for gas exchange decreases. E) patients present with cyanosis.
All of the following are organs of the endocrine system, except
A) pituitary. B) thyroid. C) thymus. D) muscle. E) pancreas.