Which of the following contributes to the atom’s atomic mass?
a. proton
b. neutron
c. electron
d. both proton and neutron
d. both proton and neutron
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The absorptive effectiveness of the small intestine is enhanced by increasing the surface area of the mucosal lining. Which of the following accomplish this task?
A) plicae circulares and intestinal villi B) the vast array of digestive enzymes C) Brunner's glands D) the rugae
Central chemoreceptors respond to changes in arterial oxygen and carbon dioxide.
Answer the following statement true (T) or false (F)
The secondary oocyte completes the second meiotic division when
A. the mature follicle ruptures. B. it is penetrated by a sperm cell. C. it is implanted in the uterus. D. it receives both estrogen and progesterone. E. ovulation occurs.
Aquaporin channels are only found in the collecting duct.
a. true b. false