Accelerated closure of the epiphyseal plates could be caused by
A) high levels of vitamin D.
B) too much calcium in the diet.
C) elevated levels of estrogen.
D) too little thyroxine.
E) an excess of growth hormone.
C
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Niacin can be synthesized in human cells from the essential amino acid ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following connective tissue cells produces collagen?
A) adipocytes B) fibroblasts C) macrophages D) mast cells E) lymphocytes
The development of specialized cells from unspecialized stem cells is a description of which of the following basic life processes?
a. metabolism b. movement c. growth d. differentiation e. reproduction
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.