Mast cells are ________
a. are transformed monocytes
b. are a subset of B-cells
c. a subset of T-cells
d. are macrophages that remain in the circulation
e. are analogous to sensing-integrating endocrine glands.
E
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The term caudal means toward the feet.
Answer the following statement true (T) or false (F)
The large, negatively charged intracellular proteins (A-) cannot permeate the cell membrane because
a. they are greater than 0.8 nm in diameter and are not lipid soluble. b. there are no carriers for them. c. no concentration or electrical gradient exists for them. d. two of these answers. e. all of these answers.
Cells that line the fluid-filled ventricles of the brain, some of which produce cerebrospinal fluid, are called ____
a. oligodendrocytes b. astrocytes c. microglia d. ependymal cells
If neither testosterone nor mullerian-inhibiting hormone is secreted during embryonic development,
A. the mesonephric duct system is stimulated. B. internally female reproductive structures form. C. the paramesonephric duct system degenerates. D. internally male reproductive structures form. E. the individual appears as a male.