Put these events in the correct chronological sequence:
1. End-plate potentials trigger action potentials.
2. Transverse tubules convey potentials into the interior of the cell.
3. Acetylcholine binds to receptors on the motor end plate.
4. Ca2+ is released from the sarcoplasmic reticulum.
A) 3, 1, 4, 2
B) 1, 2, 3, 4
C) 2, 1, 4, 3
D) 4, 3, 2, 1
E) 3, 1, 2, 4
E) 3, 1, 2, 4
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Chemical reactions that yield energy, such as heat, are said to be
A) endergonic. B) activated. C) exergonic. D) neutral. E) thermonuclear.
In adults, the only site of red blood cell production and the primary site of white blood cell formation is
A) the liver. B) the spleen. C) the thymus. D) red bone marrow. E) yellow bone marrow.
The nail ________ covers the nail bed.
A) root B) body C) lunula D) cuticle E) eponychium
Which of the following does not occur to compensate for a fall in blood pressure below normal?
a. cardiac output is increased. b. total peripheral resistance is decreased. c. heart rate is increased. d. venous vasoconstriction occurs. e. stroke volume is increased.