Niacin can be synthesized in human cells from the essential amino acid ________.
Fill in the blank(s) with the appropriate word(s).
tryptophan
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Which of the following is a primary function of the lymphatic system?
A) circulation of nutrients B) circulation of hormones C) production, maintenance, and distribution of lymphocytes D) production, maintenance, and distribution of plasma proteins E) blocking the action of histamine
The respiratory system carries oxygen and nourishment to the cells of the body.?
Indicate whether the statement is true or false
Circulatory changes that occur in inflammation include
A. increased viscosity of the blood. B. vasoconstriction. C. decreased vascular permeability. D. increased vascular permeability. E. decreased blood flow to the area.
Which of following does not influence the rate of molecular movement?
A. The molecular weight of the diffusing molecules B. The concentration of the substance C. The amount of energy available for transport molecules D. Distance