Before birth, blood bypasses from the right atrium to the left atrium through the foramen ovale. In the adult, what structure is the remnant of the foramen ovale?
A) fossa ovalis
B) obturator foramen
C) coronary sinus
D) ligamentum arteriosum
Answer: A) fossa ovalis
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Movement of the cupula in the ampullae of the semicircular canals allows detection of
A) rotational movements. B) high frequency sound. C) linear acceleration. D) low frequency sound. E) a change in body position with respect to gravity.
When blood starts to become more alkaline than normal, the renal tubules begin to
A. secrete H+ while reabsorbing bicarbonate in exchange through type A cells. B. secrete bicarbonate while reabsorbing H+ in exchange through type B cells. C. secrete bicarbonate and H+ through type B cells. D. absorb bicarbonate and H+ through type A cells.
Hormones that can pass through the plasma membrane are ________ and are called ________.
A. nonpolar; hydrophobic B. nonpolar; hydrophilic C. polar; hydrophilic D. polar; hydrophobic
The release of calcium ions from the sarcoplasmic reticulum in response to an action potential is known as ________
A) power stroke B) sliding filament theory C) tropomyosin D) excitation-contraction coupling