In response to stress, the adrenal medulla releases ________, which has the effect of increasing heart rate and blood pressure.
Fill in the blank(s) with the appropriate word(s).
epinephrine
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If you centrifuge (spin) whole blood, you will find the red blood cells (erythrocytes) at the bottom of the tube and white blood cells atop them. This implies that ________
A) red blood cells are larger than white blood cells B) white blood cells are fewer in number than red blood cells C) white blood cells are smaller than red blood cells D) red blood cells have a greater density than white blood cells
Thymic hormones in the thymus are produced by ________ cells.
Fill in the blank(s) with the appropriate word(s).
Enkephalins are neuropeptides
Indicate whether the statement is true or false
An organic molecule consists of carbon, hydrogen, oxygen, nitrogen, and sulfur; the molecule is probably
A. an amino acid. B. a triglyceride (fat). C. carbon dioxide. D. a phospholipid. E. a monosaccharide.