Sperm cannot fertilize an egg until what has occurred?
A. Their plasma membrane is toughened by cholesterol.
B. They undergo acromegaly.
C. They lose their midpiece.
D. They are in the vagina for 72 hours.
E. They undergo capacitation.
E. They undergo capacitation.
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Most of the renal sinus is filled by which of the following structures?
A. Renal medulla B. Renal pyramids C. Renal cortex D. Minor calyces E. Renal pelvis
What part of the eye prevents the eyeball from collapsing?
A) ciliary processes B) aqueous humor C) vitreous body D) suspensory ligaments
Which of the following is not a result of diarrhea?
a. dehydration b. loss of nutrient material c. increased production of HCl d. metabolic acidosis e. elimination of harmful material
Which of the following is most responsible for detecting an increase in systemic arterial H+ concentration?
A. the medulla of the brainstem B. the peripheral chemoreceptors C. the central chemoreceptors D. the diaphragm E. the dorsal respiratory group