Which property of diffusion best helps explain the necessity of the circulatory system in multicellular organisms?
A) Diffusion rate is inversely related to molecule size.
B) Diffusion is rapid over short distances but much slower over long distances.
C) Molecules move from an area of higher concentration to an area of lower concentration.
D) Diffusion can take place in an open system or across a partition that separates two systems.
B) Diffusion is rapid over short distances but much slower over long distances.
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What ion is necessary for the coagulation process?
A. sodium B. potassium C. magnesium D. calcium
Raynaud's disease ________
A) is frequently life threatening B) is induced by heat stress C) occurs primarily in association with injury to the spinal cord D) is characterized by exaggerated vasoconstriction in the extremities
A person suffering from ________ can see distant objects more clearly than those that are close.
A) myopia B) hyperopia C) glaucoma D) emmetropia E) cataracts
Why is a cell-mediated immune response more effective against intracellular microorganisms (such as viruses) than an antibody-mediated response?
A. Cell-mediated response results in destruction of cells containing the intracellular microorganism; antibodies can not enter cells. B. Cell-mediated (vs. antibody-mediated) response results in activation of many more immune cells, so it is more effective at destroying antigens. C. Intracellular microorganisms are too large for antibodies to be effective against. D. Intracellular microorganisms are too small for antibodies to be effective against.