From which chamber of the heart does the right ventricle receive blood?
a. right atrium.
b. left atrium.
c. left ventricle.
d. none of the above.
d
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Organisms at the first trophic level _____
a. capture energy from a nonliving source b. are eaten by organisms at higher trophic levels c. are shown at the bottom of an energy pyramid d. all of these
What are the two components of the human placenta?
A. chorionic frondosum and chorionic villus B. chorionic frondosum and decidua basalis C. decidua basalis and chorionic villus D. chorionic villus and endometrium E. chorionic frondosum and amnion
Select the best response to the question. ? ?Chlamydia's long incubation period, (7-21 days between exposure and becoming symptomatic) contributes to what clinical concern?
A) the development of resistant strains of the disease B) more intense signs and symptoms C) difficulty identifying the specific pathogen causing the disease D) a large number of asymptomatic individuals who continue to spread the disease
Virus infected cells and tumor cells are targeted by ________, which are lymphoid derived cells of the innate immunity
a. cytotoxic T cells b. neutrophils c. plasma cells d. natural killer cells