Walking on hot coals in an example of a ________ altering reflex activity.
Fill in the blank(s) with the appropriate word(s).
higher center
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Which hormone does the adrenal medulla secrete?
A. Aldosterone B. Cortisol C. Glucocorticoids D. Catecholamine E. Endorphin
Which of the following is not true regarding the right atrioventricular valve?
A) It has 3 cusps. B) It is also called the tricuspid valve. C) It prevents backflow of blood from the right ventricle into the right atrium. D) The valve closes when the right atrium contracts. E) The cusps provide one-way flow of blood.
If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contraction occurs. This is called
A) incomplete tetanus. B) complete tetanus. C) treppe. D) wave summation. E) recruitment.
In a workout your muscle cells produce lactate, yet you maintain a constant blood pH because ________.
A. metabolic bases are produced at the same rate by muscle cells to neutralize the acids B. the respiratory system removes excess H+ from the blood before the pH is lowered C. endothelial cells secrete excess H+ to prevent a decrease in pH D. metabolic acids are neutralized in muscle cells before released into the blood E. the body contains chemicals called buffers that resist changes in pH