How does the size of the thorax change during:
What will be an ideal response?
a. inhalation—increases. b. exhalation— decreases.
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The structural theory that explains how a muscle fiber contracts is called the ________ theory
A) sliding filament B) excitation-contraction coupling C) neuromuscular D) muscle contraction E) action-myosin interaction
Which part of the brain contains the cardiovascular center that regulates heart rate?
a) Midbrain b) Cerebrum c) Medulla oblongata d) Cerebellum e) Thalamus
Why doesn't semen enter the urinary bladder during ejaculation?
A) The smooth muscle sphincter at the base of the urinary bladder closes. B) There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood. C) Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles. D) There is no common duct between the reproductive system and the urinary system.
A function of the placenta is to
A) produce hormones. B) support the weight of the fetus developing within the uterus. C) prevent gas and nutrient exchange between the fetus and the mother. D) allow direct exchange of blood between the mother and fetus for nutrition. E) All of the answers are correct.