The parathyroid glands produce a hormone that
A) stimulates the formation of white blood cells.
B) increases the level of calcium ions in the blood.
C) increases the level of sodium ions in the blood.
D) increases the level of potassium ions in the blood.
E) increases the level of glucose in the blood.
B
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Presynaptic facilitation results from
a. alteration of calcium permeability b. continued generation of EPSPs c. neuromodulator effects d. increased neurotransmitter production e. none of the above
What are caveolae?
A. Enzymes that removes phosphate from myosin B. Structures that allow for relatively constant tension maintained for a period of time C. Shallow invaginations of plasma membrane D. Ion channels that allow for rapidly developing action potentials E. Parts of the intracellular cytoskeleton
Arrange the following structures in the order sperm cells would pass through as they move from the seminiferous tubules to the urethra.(1) Ductus deferens (vas deferens)(2) Efferent ductules(3) Epididymis(4) Ejaculatory duct(5) Rete testis
A. 5, 2, 4, 3, 1 B. 3, 2, 4, 1, 5 C. 3, 4, 2, 1, 5 D. 5, 2, 3, 1, 4 E. 5, 3, 2, 1, 4
Spermatogenesis requires which of the following hormones?
A. LH B. FSH C. Testosterone D. All three are necessary for spermatogenesis.