Which factors are believed to be responsible for acne?
A. Viruses, including Herpes virus
B. Overproduction of sebum by sebaceous glands
C. Hormone levels
D. Overproduction of sweat by eccrine glands
E. Bacteria, including Propionibacterium acnes
F. Abnormal production of cells
G. Sugary and fried food
Ans:
C. Hormone levels
E. Bacteria, including Propionibacterium acnes
F. Abnormal production of cells
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An example of fungal infection is ________
A) Athlete's foot B) Thrush C) Common cold D) A and B only
Neural stem cells in the CNS
A. have no known function. B. can only form glial cells. C. can form new neurons throughout the CNS. D. can form new neurons in only certain portions of the CNS such as the hippocampus. E. can migrate to the PNS as needed.
The greatest resistance to blood flow occurs in which of the following vessels?
a. arterioles b. capillaries c. venules d. veins
John is a sprinter who specializes in quick and powerful bursts of speed followed by periods of rest. Jim is a marathon runner who specializes in long, steady runs. Compared to John's muscles, how are Jim's most likely to differ?
A. Jim's muscles will have more glycogen stored in his type IIb muscle fibers. B. Jim's muscles will have more mitochondria in his type I and IIa muscle fibers. C. Jim's muscles will have less myoglobin in his type I muscle fibers. D. Jim's type IIb fibers will be larger in diameter. E. Jim will have a greater proportion of type II muscle fibers and a lower proportion of type I fibers than John.