The contraction of any one cardiac muscle fiber
A) will cause the rate of heart muscle contraction to increase.
B) will immediately trigger an all-or-none response in all other cardiac fibers.
C) will stimulate the electrical conduction system of the heart.
D) will cause the contraction of several others.
E) None of the answers are correct.
D) will cause the contraction of several others.
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There are three anterior thoracic muscles. Select the exception
A. Levator scapulae B. Pectoralis minor C. Serratus anterior D. Subclavius
During the stress response, glucocorticoids assist in.
A) increasing blood glucose levels and stabilizing blood pressure. B) maintaining normal cerebral function. C) stimulating increased secretion of aldosterone and insulin. D) preventing excessive secretion of epinephrine.
The elasticity of the lens decreases with age. This leads to which of the following?
A) less light getting to the retina and diminished visual acuity B) lowered accommodation of the pupillary reflex and blurry vision C) a clouding of the lenses know as a cataract D) less accommodation of the lenses and difficulty focusing on nearby objects
The cranial nerve that supplies parasympathetic innervation to the thoracic organs is
A. CN X. B. CN II. C. CN VI. D. CN III. E. CN IX.