Negative-feedback control involves which of the following?
A. The product of a gland stimulates the gland to produce more product.
B. The product of gland A stimulates gland B to produce its hormone, which inhibits gland A.
C. The hormone produced by gland A stimulates gland B.
D. The hormone produced by gland A stimulates gland B to produce its hormone, which stimulates gland A.
B. The product of gland A stimulates gland B to produce its hormone, which inhibits gland A.
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Which of the following is NOT a known dysfunction
in the expression of sickle-cell anemia? a. impaired brain function b. rheumatism c. heart failure d. excessive absorption of oxygen causing the cell to swell e. enlarged spleen
During intense physical exercise, human cells and tissues increase their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen?
What will be an ideal response?
The first organic molecule to be synthesized from inorganic substances was _____.
A. urea B. acetic acid C. ammonium cyanate D. insulin E. DNA
Which one of the following terms is sometimes called "cell eating"?
A. pinocytosis B. phagocytosis C. exocytosis D. plasmolysis