"Osmosis" refers to the movement of what substance across semipermeable membranes?
A. glucose
B. charged particles
C. lipid molecules
D. water
E. solutes
D
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Areas of the spleen that contain large aggregations of lymphocytes are known as
A) Peyer's patches. B) adenoids. C) white pulp. D) red pulp. E) lymph nodes.
Cells of the body mainly use __________ for the selective endocytosis of most macromolecules.
a) receptor-mediated endocytosis b) diffusion c) fluid-phase endocytosis d) pinocytosis
During a transfusion, if incompatible antigens are introduced, antibodies can bind to foreign antigens, causing them to clump together, or:
A) granulate. B) agglutinate. C) coagulate. D) activate.
The atrioventricular node is the normal pacemaker of the heart
a. True b. False Indicate whether the statement is true or false