In the slow block to polyspermy, sperm penetration releases an inflow of ________, which in turn stimulates the ________
A) K+; zona pellucida
B) Ca2+; fertilization membrane
C) Na+; fertilization membrane
D) Ca2+; cortical reaction
E) Cl-; corona radiata
D
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The acrosome
A. provides nourishment to the sperm. B. is responsible for movement of a spermatozoan. C. contains enzymes to break through protective layers surrounding the secondary oocyte. D. initiates growth of the sperm tail. E. carries the DNA.
In mammals, the midbrain can be grouped together with the pons and medulla oblongata, and is called the __________
Fill in the blank with the correct word.
Select the correct statement about blood flow.
A) It is relatively constant through all body organs. B) It is measured in mm Hg. C) It is greatest where resistance is highest. D) Blood flow through the entire vascular system is equivalent to cardiac output.
Passive transport of water is known as ________.
A. facilitated diffusion B. osmosis C. filtration D. a water pump