The complement system functions to ____ and ____
a. mobilize B cells; initiate antibody production
b. help the innate immune system; turn on expression of T-cell receptor protein genes
c. destroy invading cells; provide a physical barrier against pathogens
d. destroy invading cells; guide phagocytes to the infection site
e. destroy viruses; guide phagocytes to the site of inflammation
d
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Which of the following is true regarding hagfish and lampreys?
A. They are characterized by a bony lower jaw. B. They are invertebrates. C. They are bony fish. D. They are vertebrates.
The function of valves in the heart is to
a. form blood cells. b. participate in immunity. c. prevent backflow of blood. d. prevent clot formation. e. push blood ahead.
Finches have lived in Hawaii for:a
1000 years. b. 100 000 years. c. 4 million years. d. 5 million years. e. 63 million years.
What are blood vessels that normally bypass capillary beds are called?
A) venules B) pararterioles C) pre-capillary sphincters D) A-V malformations E) metarterioles