Alexander is a 15-year-old boy with extensive acne on his nose, forehead, and cheeks. He reached puberty at age 14, at which point his acne became more abundant in these areas. What is the anatomic basis for his acne?
a. His merocrine sweat glands have begun producing abundant amounts of sweat.
b. His sebaceous gland ducts have become blocked.
c. His sebaceous glands are not producing enough sebum to lubricate his skin.
d. His apocrine sweat glands are producing a secretion that has a marked odor.
b. His sebaceous gland ducts have become blocked.
You might also like to view...
The actual site of information processing in the nervous system
A. Axonal hillock B. Axon C. Nucleus D. Nissl bodies
In the parasympathetic branch of the nervous system, which activity does acetylcholine NOT perform?
A. Exciting skeletal muscles B. Inhibiting cardiac muscle activity C. Blocking smooth muscle activity D. Stimulating emotion and memory
The autonomic nervous system is
a. part of the somatic nervous system. b. considered to be the involuntary branch of the efferent division of the peripheral nervous system. c. part of the central nervous system. d. two of these answers. e. all of these answers.
(visualize self in raft) You are in the big toe traveling toward the heart. The last vessel you pass through before entering the heart is the
aorta. inferior vena cava. coronary artery. pulmonary vein.