What are interferons?
A. Chemicals that raise the body temperature
B. Chemicals released by damaged tissue to cause blood vessels to widen
C. Proteins activated by the presence of a pathogen
D. Chemicals released by virally infected cells that encourage the production of antiviral proteins
Answer: C
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Elevated levels of calcium ion in the blood stimulate the secretion of the hormone
A) calcitonin. B) thyroid hormone. C) parathyroid hormone. D) growth hormone. E) testosterone.
During a cardiac cycle, how many of the four chambers contract at any one time?
A. 1 B. 2 C. 4 D. Highly variable, depending on the heart beat rate E. None of the choices is correct.
Livestock are too large to be weighed on a scale
Indicate whether the statement is true or false
After birth, the mother may lose excess fluids as a discharge from the uterus known as:
A) colostrum. B) lochia. C) lactation. D) meconium.