Which of the following is true of the coronary arteries?
A) They branch off the pulmonary veins.
B) They open and close in pulsation with the contraction and relaxation of the heart ventricles.
C) Together they supply part of the heart muscle with oxygen.
D) They originate at the base of the aorta and are the first branches off this vessel.
E) None of the answers are correct.
D) They originate at the base of the aorta and are the first branches off this vessel.
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Which of the following is the hormone most responsible for ovulation?
A) Progesterone B) Luteinizing hormone C) Estrogen D) Follicle-stimulating hormone
Which of the following does not occur to compensate for a fall in blood pressure below normal?
a. cardiac output is increased. b. total peripheral resistance is decreased. c. heart rate is increased. d. venous vasoconstriction occurs. e. stroke volume is increased.
Identify the following
Glucagon ____________________.
lowers blood sugar raises blood sugar lowers glucocorticoids increases glycogen production None of the choices are correct