The ________ is composed of circularly arranged layers of smooth muscle cells
A. tunica media
B. tunica externa
C. tunica intima
D. tunica interna
E. None of the answers is correct.
A
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Which of the following time periods is termed electromechanical delay?
A. the time required for conduction of the nerve impulse to the neuromuscular junction B. the time required for the nerve impulse to cross the neuromuscular junction C. the time required for the muscle to initiate the development of tension after receipt of the nerve impulse D. the time required for a muscle to reach peak tension after the development of tension is initiated
In the heart, the halfmoon-shaped _________________________________________ valve controls blood entering the arterial system from its location between the left ventricle and the aorta
Fill in the blank(s) with correct word
Adrenal insufficiency is characterized by decreased function of the ______________ and consequent underproduction of ______________.
A) adrenal glands, catecholamines B) adrenal medulla, norepinephrine C) adrenal cortex, cortisol and aldosterone D) adrenal glands, epinephrine and norepinephrine
What is the first event in muscle fiber contraction?
A. Acetylcholine is released from the end of the motor neuron. B. Acetylcholine diffuses across a gap at a neuromuscular junction. C. Calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D. The muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules.