In the ________ circuit, blood leaving the ________ ultimately delivers oxygen and nutrients to all of the body's tissues and organs
A) pulmonary; lung capillaries
B) systemic; vena cava
C) pulmonary; myocardium
D) systemic; left ventricle
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The primary function of an enzyme or any biological catalyst is to
A. reduce the energy of activation of a reaction. B. increase the rate of a reaction. C. increase the rate of a reaction and change the direction of a reaction. D. reduce the energy of activation and increase the rate of a reaction. E. change the direction of a reaction.
The AIDS phase of HIV infection begins when the concentration of CD4 T cells in the blood drops below what concentration?
A) 2,000 cells per cubic millimeter B) 1,000 cells per cubic millimeter C) 500 cells per cubic millimeter D) 200 cells per cubic millimeter E) No CD4 T cells are observed.
Microvilli
A. provide increased surface area for the exchange of materials. B. provide support for the cell. C. provide channels for the transport of materials within the cell. D. greatly increase the cell's volume.
The layer where organisms can exist on the surface of the earth is the
(a). biosphere. (b). ecosystem. (c). population. (d). homeostasis. (e). community.