a muscle of uniform width with fascicles aligned along its longitudinal axis would be classified as a _____________ muscle.
Fill in the blank(s) with the appropriate word(s).
parallel
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Placenta previa occurs when
A. the placenta is formed too early. B. implantation occurs close to the cervix. C. a normally placed placenta tears away from the uterine wall. D. implantation occurs in the fundus of the uterus.
What happens when acetylcholine stimulates its receptors in the neuromuscular junction?
A) The inhibitory effect of acetylcholinesterase is overridden. B) The threshold of the muscle fiber lowers. C) The release of Ca2+ from the sarcoplasmic reticulum decreases. D) The permeability of the sarcolemma to Na+ increases. E) The positive charge on the sarcolemma decreases.
The anterior and posterior interventricular sulci on the outside of the heart contain
A) coronary arteries. B) grooves. C) fat. D) cardiac veins. E) All of the answers are correct.
Compare concentric and eccentric contractions
A) Concentric contractions consist of equal lengths of time contracting and relaxing. Eccentric contractions consist of a longer time contracting than relaxing. B) Concentric contractions consist of equal lengths of time contracting and relaxing. Eccentric contractions consist of a longer time relaxing than contracting. C) Concentric contractions occur when the tension produced never exceeds the load, and the muscle does not change length. Eccentric contractions occur when the tension produced exceeds the load, and the muscle shortens. D) Concentric contractions occur when the muscle tension exceeds the load, and the muscle shortens. Eccentric contractions occur when the muscle tension is less than the load, and the muscle elongates. E) Concentric contractions occur when the muscle tension is less than the load, and the muscle elongates. Eccentric contractions occur when the muscle tension exceeds the load, and the muscle shortens.