Irving, who is 78 years old, takes human growth hormone supplements to regain the strength of his youth. He may be disappointed because the hormone has been shown only to
A. increase his risk of cancer.
B. increase the red blood cell supply.
C. decrease fat and increase muscle mass, but not improve strength.
D. make him urinate more often.
Answer: C
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Which of the choices below is a function of the nephron loop?
A) form a large volume of very dilute urine or a small volume of very concentrated urine B) absorb electrolytes actively and water by osmosis in the same segments C) absorb water and electrolytes into the tubular network D) form a large volume of very concentrated urine or a small volume of very dilute urine
Contraction of the __________ muscles will elevate the ribs and move the sternum
Fill in the blank(s) with the appropriate word(s).
Why is blockage of a coronary artery such a serious threat to cardiac muscle?
A. Cardiomyocytes rely on a constant supply of calcium. B. Cardiomyocytes have abundant mitochondria and rely on a constant supply of oxygen. C. The myosin of cardiomyocytes is unique and requires abundant nutrients and oxygen. D. Cardiomyocytes have weak sarcolemmas that easily rupture. E. Cardiomyocytes are fast-twitch fibers.
To speed healing from surgery, incisions should be placed ________ to lines of cleavage.
A. perpendicular B. parallel