When a muscle is stimulated repeatedly at a high rate, the amount of tension gradually increases to a steady maximum tension. This state of maximum tension is called
A) incomplete tetanus.
B) complete tetanus.
C) a twitch.
D) wave summation.
E) recruitment.
B
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Despite its apparent durability, the dermis is subject to tearing. How might a person know that the dermis has been stretched and/or torn?
A) The pain is acute due to the large number of Meissner's corpuscles. B) The appearance of visible, silvery-white scars is an indication of stretching of the dermis. C) The blood vessels in the dermis rupture and the blood passes through the tissue, causing "black-and-blue marks." D) The stretching causes the tension lines to disappear.
Simple and conditioned salivary secretions are controlled by separate ANS pathways.
Indicate whether the statement is true or false
A deficiency of hormone results in an increase in the number of receptors for that hormone. This is known as _____ and results in _____.
A) Negative feedback. Increased response to the hormone. B) Down-regulation. Decreased sensitivity to the hormone. C) Positive feedback. Decreased response to the hormone. D) Up-regulation. Increased sensitivity to the hormone.
All of the following statements about the effect of aging on the muscular system are true except which one?
A. Our diet and lifestyle solely determine the rate and extent of muscle loss. B. Some muscle is replaced by fibrous tissue. C. Fat is deposited in muscle tissue and muscle fibers shrink. D. Muscle mass decreases with age.