A proper definition of muscle tone is
A. constant tension produced by muscles for long periods of time.
B. a feeling of well-being following exercise.
C. the ability of a muscle to maintain a contraction against an outside force.
D. muscles contracting together.
E. warm-up of muscle tissue.
A
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During the plateau phase of a cardiac muscle cell's action potential, the membrane stays
A. depolarized as potassium exits and calcium enters. B. depolarized as potassium enters and calcium exits. C. repolarized as sodium enters and calcium exits. D. hyperpolarized as sodium and calcium exit. E. hyperpolarized as potassium enters and calcium exits.
Mary, a nursing student, has been caring for burn patients. She notices that they consistently show elevated levels of potassium in their urine and wonders why. What would you tell her?
What will be an ideal response?
How developed is the sarcoplasmic reticulum in cardiac muscle?
a. non-existent b. poorly developed c. moderately developed d. well developed e. heavily developed
The mesentery is
A. the serous membrane that covers the lungs. B. the serous membrane that lines the abdominal and pelvic cavities. C. the membrane that lines the pericardial sac. D. a double-layered serous membrane that anchors some of the abdominal organs to the body wall. E. the space located between the visceral and parietal pleura.