A reservoir is
A) a source of microbial contamination.
B) an environment that is free of microbes.
C) any microorganism that causes disease.
D) a condition in which organisms remain in the body for a short time.
E) a source of microbes for laboratory testing.
A
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Which of the following is not a characteristic of a hormone?
A. chemical messenger B. secreted from glands into the blood C. acts on distant target cells D. regulates organ systems E. secreted from glands into the interstitial fluid
If your physician suspects you have symptoms of a genetic disease, he can collect cells for genetic testing by
A. sampling your blood cells. B. sampling cells that line your mouth. C. sampling cells in your saliva. D. All of the answer choices are correct. E. sampling the tissue which is observed to be affected.
A myeloid progenitor cell can differentiate into immune cells of the blood and lymph systems.
Answer the following statement true (T) or false (F)
The scrotum is a sac-like structure outside the abdomen in which the testes are suspended. Why is this structure essential?
A. There is too much hormonal influence if they remain in the abdomen. B. There is not enough space in the abdomen to grow properly. C. Lower temperature is required for normal development of sperm. D. Sperm must be closer to the penis to be ejaculated.