Which of the following is the best description of a precursor metabolite?
A. A macromolecule consumed in the first steps of metabolism
B. A carbon skeleton used as a starting substrate
C. An enzyme that is reduced in a metabolic reaction
D. An intermediate in the formation of cursor metabolites
Answer: B
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What cell type would have a high concentration of metabolic enzymes?
A. nerve cell B. mammary cell C. lung cell D. liver cell E. cartilage cell
Erythropoietin
a. is the most common blood protein. b. is secreted by the liver. c. stimulates the red bone marrow to generate red blood cells. d. is an enzyme that functions in blood clotting. e. increases the ability of plasma to transport carbon dioxide.
Which of the following terms is used to label the rhythmic changes in sympathetic and parasympathetic activity that affect heart rate coincident with respiration?
A) pulmonary sinus arrhythmia B) respiratory sinus rhythmia C) respiratory sinus arrhythmia D) lung sinus rhythmia E) pulmonary sinus rhythmia
The ascending limb of the nephron loop
A) is permeable to salt. B) is permeable to water. C) is the primary site of tubular secretion. D) pulls salt from the renal medulla to make the filtrate more concentrated. E) responds to high levels of ADH in the blood.