The most important factor for regulating respiratory rate is
A) bicarbonate level in the blood.
B) oxygen level in the blood.
C) CO2 level in the blood.
D) urea concentration in the blood.
Ans: C) CO2 level in the blood.
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Commissural tracts
A. extend between the right and left cerebral hemispheres. B. connect a region of one lobe with another lobe in the same hemisphere. C. connect different regions within a lobe. D. connect different regions of the cerebral cortex within the same hemisphere. E. link the cerebral cortex to the caudal brain regions and the spinal cord.
Normal cardiac muscle is similar to normal skeletal muscle in terms of
A) the duration of the action potentials, which last 250-300 msec. B) the duration of the resulting contractions. C) the refractory period, which continues until relaxation is under way. D) the appearance of calcium among the myofibrils. E) the appearance of summation of twitches.
When a person with an allergic tendency is first exposed to a particular allergen, what cytokine is secreted by compatible helper T cells?
a. IL-2 b. IL-3 c. IL-4 d. IL-5 e. IL-6
PTH enhances the rapid movement of calcium from the bone fluid into the plasma
Indicate whether the statement is true or false