During digestion, the concentration of hydrogen ions (H+) in the stomach contents increases to many times that in cells lining the stomach. Which transport process could be responsible?
A) osmosis
B) simple diffusion
C) facilitated diffusion
D) active transport
E) exocytosis
Answer: D
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A. obstruction of airways. B. excessive water intake. C. prolonged vomiting or prolonged diarrhea. D. prolonged sleep deprivation.
The cerebral lobe posterior to the central sulcus is the
A) parietal lobe. B) temporal lobe. C) frontal lobe. D) occipital lobe. E) insula.
Antigen-presenting cells usually display processed antigens to T cells in the _____________.
A. blood plasma B. lymph nodes C. thymus D. red bone marrow E. liver
How are sperm acted upon by the reproductive system of the female?
A) The gametes are nourished. B) The gametes are stored to optimize at a later time for fertilization. C) The gametes are replicated. D) They undergo capacitation. E) The gametes are destroyed after a few hours, as they are no longer capable of fertilization.