Myoglobin ________.
A) breaks down glycogen
B) is a protein involved in the direct phosphorylation of ADP
C) stores oxygen in muscle cells
D) produces the end plate potential
C) stores oxygen in muscle cells
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Which of the following would be a normal response of the cardiovascular system to a decreased frequency of action potentials arising from the baroreceptors?
a) Increased systemic vascular resistance b) Increased parasympathetic stimulation c) Decreased heart rate d) Decreased stroke volume e) Decreased cardiac output
What determines whether a person has type A, B, or O blood?
A. Antibodies in blood plasma that react against foreign red blood cells B. Antibody receptors on the surface of red blood cells C. Glycolipids that act as antigens on the surface of red blood cells D. Variant structures of hemoglobin within red blood cells E. The presence or absence of spectrin in plasma membranes of red blood cells
The placenta plays an important role in
A. implantation. B. onset of lactation. C. beginning of parturition. D. provision of nutrients to the fetus. E. insulating the fetus.
Which statement about reflexes is true?
A. A reflex is involuntary. B. A reflex has a fast response. C. A reflex is a motor response. D. All of these statements are true.