Skin color is the result of the
A. quantity of melanin in the skin.
B. number of melanocytes in the skin.
C. amount of adipose in the subcutaneous layer.
D. number of keratinocytes in the skin.
E. thickness of the stratum basale.
Answer: A
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What is the effect of renin?
A. It inhibits thirst. B. It raises blood pressure. C. It lowers blood pressure. D. It stimulates sodium excretion. E. It leads to increased urine volume.
The movement of substances from the blood into the renal tubules is called:
a. reabsorption b. glomerular filtrate c. secretion d. none of the above
Action potentials in neurons in the inspiratory center of the medulla oblongata result in action potentials in the ________ nerves to the diaphragm, which in turn cause ________ of the muscle, resulting in a/an ________ in the volume of the thoracic cage
A. motor; contraction; decrease B. parasympathetic; contraction; decrease C. sympathetic; contraction; increase D. motor; contraction; increase E. sympathetic; relaxation; increase
________ capillaries have pores within each endothelial cell.
Fill in the blank(s) with the appropriate word(s).