Excitatory postsynaptic potentials are produced in the brain primarily by ________.
A. glutamic acid
B. gamma-aminobutyric acid
C. benzodiazepines
D. glycine
Answer: A
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What protein are bone matrix fibers are composed of?
A. Collagen B. Elastin C. Keratin D. Fibrin E. Osteon
In male embryos, which hormone is responsible for the development of the urethra, prostate, and external genitals?
a) LH b) FSH c) Progesterone d) Estrogen e) Dihydrotestosterone
Osteoblasts
a. secrete the organic matrix components of bone. b. become osteocytes once they become entrapped in the bone that they form. c. dissolve bone. d. form cartilage. e. both (a) and (b) above.
In the spleen, the white pulp contains ________ and the red pulp contains ________.
A. mostly red blood cells with some lymphocytes and macrophages; mainly lymphocytes B. red blood cells; neutrophils, basophils, and eosinophils C. neutrophils; monocytes D. mainly lymphocytes; mostly red blood cells with some lymphocytes and macrophages E. mostly macrophages; mainly lymphocytes