In general, as an artery's diameter decreases, the artery walls show
A. an increase in relative amounts of smooth muscle and elastic fibers and a decrease in endothelium.
B. a decrease in the relative amount of smooth muscle and an increase in the relative amount of elastic fibers.
C. a decrease in both smooth muscle and elastic fibers and an increase in areolar connective tissue.
D. an increase in the relative amount of smooth muscle and a decrease in the relative amount of elastic fibers.
Answer: D
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An isometric contraction is described as
A. a muscle produces an increasing tension as the length remains constant. B. a muscle produces increasing tension as it shortens. C. a muscle produces tension, but the length of the muscle is increasing. D. a muscle produces constant tension during contraction. E. action potential frequency is high enough that no relaxation of muscle fibers occurs.
Which of the following is not a part of the vulva?
A. Prepuce B. Bulbourethral glands C. Labia D. Mons pubis
The area that connects the cell body to the axon is called the
A) Nissl body. B) neurofibril. C) axon hillock. D) axoplasm. E) initial segment.
Which vessel carries oxygenated blood from the lung to the left atrium of the heart?
A) postcava B) pulmonary artery C) precava D) pulmonary vein