A second nerve impulse cannot be generated until ________
A) all sodium gates are closed
B) the membrane potential has been reestablished
C) the Na ions have been pumped back into the cell
D) proteins have been resynthesized
B
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Which components of blood do NOT perform defensive functions?
A. Platelets B. Red blood cells C. Antibodies D. White blood cells
The vessel draining the deoxygenated blood from the heart itself is the
A. SVC. B. IVC. C. aortic sinus. D. coronary sinus.
The stress relaxation response enables hollow organs, like the stomach, to accommodate increases in the volume of its contents. Typically, an upper limit is placed on the volume, however, by
a. reflex contraction initiated in response to stretch. b. tension due to stretching of the intermediate filaments within the smooth muscle. c. inelastic connective tissue associated with the smooth muscle of the organ. d. the number of cross-bridge sites present on the myosin filaments.
Reflexes help to control
A) respiratory rate. B) digestive activities. C) heart rate and blood pressure. D) all of the above.