After removal of an elbow cast, Lauren noticed her arm was immovable. What happened to her arm?
What will be an ideal response?
Two things have occurred to Lauren while she was convalescing from her injury. First, the immobilization of the arm caused some muscle mass to atrophy. Second, the loss of muscle was replaced with tough connective tissue that locked her arm in place. With therapy the tissue can be stretched or torn enough to return the full range of motion.
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The heartbeat is initiated by the cardiac muscle fibers of the ________ node.
Fill in the blank(s) with the appropriate word(s).
Calcium reabsorption by the kidneys is promoted by the hormone
A) calcitonin. B) parathyroid hormone. C) aldosterone. D) cortisol. E) ADH.
Water intoxication causes
A) high blood sodium. B) abnormal accumulation of extracellular fluid. C) low blood sodium. D) low blood potassium.
Which of the following is most closely associated with a skeletal muscle fiber's latent period?
a. hyperpolarization b. relaxation c. diffusion of calcium out of the SR's lateral sacs d. development of tension e. shortening of the muscle fiber