Complement:
a. consists of a group of protein molecules
b. is activated by antibodies
c. is usually found in an inactive form in the blood
d. all of the above
d. all of the above
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How many tertiary bronchi are typically present in each lung?
A) 1-2 B) 3-4 C) 9-10 D) 15-20 E) 20-25
Which is TRUE about sperm delivery?
A. Most of the ejaculated sperm arrive in the vicinity of the ovum (if there is one). B. Sperm transport through the cervix is made possible by actions of progesterone on the cervical mucus. C. Of the several hundred million sperm in an ejaculation, only about 100 to 200 reach the fallopian tube. D. Sperm are able to fertilize an egg from the instant they arrive in the female reproductive tract. E. Sperm can survive for up to 2 weeks in the mucus of the cervix.
Mr. Smith moved from a low altitude to a high altitude and experienced an increase in RBCs. Which of the following caused this increase?
A. the lower temperature present at higher altitudes B. the lower oxygen concentration seen at higher altitudes C. the increased metabolic rate seen at higher altitudes D. the increased CO2 retention that occurs at high altitudes E. He exercised more.
What are the four mechanisms of heat exchange and how are they defined?
What will be an ideal response?