The most important chemical regulator of respiration is
A) oxygen.
B) carbon dioxide.
C) bicarbonate ion.
D) sodium ion.
E) hemoglobin.
B
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Which of the following is a characteristic of mature red blood cells?
A. They are able to undergo mitosis. B. They lack a nucleus. C. They have numerous mitochondria. D. They carry most of the carbon dioxide that is transported in the blood. E. They play an important role in immune defense.
The temperature-sensitive receptors that monitor skin and core temperature are termed ____________________
Fill in the blank(s) with correct word
The nucleus and other organelles of a neuron are primarily housed in which part of the cell?
A. Glial cell B. Dendrite C. Axon D. Cell body E. None of the choices is correct.
During ventricular contraction, the semilunar valves close in order to permit the blood to enter the large arterial trunks that carry blood away from the heart.
Answer the following statement true (T) or false (F)