An action potential is generated when threshold is reached, at which time
a. voltage-gated K+ channels close.
b. voltage-gated Na+ channels open.
c. chemically gated Na+ channels open.
d. Ca2+ enters the cell.
b. voltage-gated Na+ channels open.
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Deflection of the basilar membrane
a. activates receptors of the scala tympani b. occurs in response to fluid movements in the utricle c. results from vibrations in the round window d. results from vibrations in perilymph around the scala media e. causes otoliths to move back and forth
To be classified as a male, one must have a ________ chromosome.
Fill in the blank(s) with the appropriate word(s).
After a mastectomy of her left breast, a woman experiences edema in her left arm. What is the probable cause?
A. The blood that would have circulated through her left breast is now trapped in her left arm. B. In addition to having cancer in her left breast, she likely has cancer in her left arm as well. C. The surgeon likely removed her left axillary lymph nodes as well. D. She was likely lying on her left side during surgery, causing inflammation in her left arm.
Which of the following is the origin of the bulbospongiosus?
A) ischial spine B) inferior ischial ramus C) linea alba and pubis D) coccyx E) collagen sheath at the base of the clitoris or penis