The secretion of cortisol is controlled by ________.
A. action potentials from the sympathetic part of the autonomic division
B. a decrease in blood concentration of sodium ions
C. a releasing hormone from the pituitary gland
D. action potentials from the parasympathetic part of the autonomic division
Answer: C
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In a neuromuscular junction, the effect of acetylcholine (ACh) binding to receptors on the motor end plate lasts only briefly due to
a) rapid uptake of the ACh into the myofiber. b) endocytosis of the ACh receptor into the myofiber. c) rapid destruction of ACh in the synaptic cleft by acetylcholinesterase. d) rapid destruction of ACh in the synaptic cleft by monoamine oxidase. e) diffusion of the ACh out of the synaptic cleft.
The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______.
A) sodium B) magnesium C) calcium D) potassium
Matching
A) A B) D C) E 6) Atrial depolarization. 7) Point after which pressure begins to rise in the aorta. 8) Ventricular repolarization. 9) Point that represents the "dup" sound made by the heart.
The heart, blood, and blood vessels combine to form which of the following?
A) a group of cells B) an organ system C) the smallest level of organization D) an organ E) an individual living entity