The pulmonary semilunar valve prevents backward flow into the
A) aorta.
B) pulmonary trunk.
C) pulmonary veins.
D) right ventricle.
E) left atrium.
Answer: D
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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.
The Wernicke area is the motor speech area of the frontal lobe
Indicate whether this statement is true or false.
What did the results of tube 3 demonstrate?
A) Amylase does not digest cellulose. B) The amylase contained contaminating cellulase. C) Peptidase digests peptides. D) Cellulose is a substrate of amylase
What is the significance of Henry's law to the process of respiration?
A) Henry's law states that in a mixture of gases, the individual gases exert a pressure proportional to their abundance in the mixture. B) Henry's law states that at a given temperature, the amount of a particular gas that dissolves in a liquid is directly proportional to the partial pressure of that gas, which underlies the diffusion of gases between capillaries and alveoli, and between capillaries and interstitial fluid. C) Henry's law states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. D) Henry's law states that at a constant temperature, the pressure of a gas is directly proportional to its volume. E) Henry's law states that at a given temperature, the amount of a particular gas that dissolves in a liquid is inversely proportional to the partial pressure of that gas, which underlies the diffusion of gases between capillaries and alveoli, and between capillaries and interstitial fluid.