Nerve fibers that are larger in diameter and heavily myelinated (A? fibers) will depolarize before smaller, unmyelinated nerve fibers (C fibers). Which of the following would you expect to occur first when applying electrical stimulation to a muscle with a high frequency (100 Hz), but low pulse duration (100 µs)?
a. Intermittent muscle contraction (unfused tetanus)
b. Consistent muscle contraction (fused tetanus)
c. "Pins and needles" sensation
d. Pain
Ans: c. "Pins and needles" sensation
You might also like to view...
Which type of epithelium is found in skin?
a. simple squamous epithelium b. stratified squamous epithelium c. cuboidal epithelium d. simple columnar epithelium e. simple pseudostratified columnar epithelium
Atmospheric O2 is actually a waste product of photosynthesis
Indicate whether the statement is true or false.
Study the life cycle diagram. Label A is the ________ life cycle.
A. sexual B. lytic C. alternation of generations D. lysogenic
A women has a fever, sore throat, and fatigue. She thinks she has the West Nile virus, but has not been to a doctor to conform her diagnosis. She is considered a:
a. Primary case b. Index case c. Secondary case d. Suspect case