A concentric contraction is described as
A. action potential frequency is high enough that no relaxation of muscle fibers occurs.
B. a muscle produces constant tension during contraction.
C. a muscle produces an increasing tension during contraction.
D. a muscle produces increasing tension as it shortens.
E. a muscle produces tension, but the length of the muscle is increasing.
D
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A person develops anti-A antibodies only after he is exposed to antigen A, and anti-B antibodies only after he is exposed to antigen B
Indicate whether the statement is true or false
Smooth muscle cells of blood vessels are described as integrating centers. Outline the various inputs that affect smooth muscle cells and how those are integrated.
What will be an ideal response?
The spinal cord ends at the level of the
A. Sacrum. B. Fourth lumbar vertebra. C. Second lumbar vertebra. D. Twelfth thoracic vertebra.
The pericardium lies within the ________, a portion of the thoracic cavity that lies between the left and right pleural cavities.
Fill in the blank(s) with the appropriate word(s).