Depolarization of the nerve plasma membrane occurs when there is a rapid influx (inflow) of ________.
A. Na+
B. K+
C. Ca2+
D. Cl?
E. proteins
Answer: A
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Glycolysis results in the breakdown of a glucose molecule and the net production of four ATP molecules
Indicate whether this statement is true or false.
The substance that an enzyme acts on in a chemical reaction is called its
A. catalyst. B. substrate. C. product. D. modulator. E. complex.
Why is high blood pressure damaging to the heart?
A. With high blood pressure, the blood is more viscous and harder to pump. B. The heart rate slows down to dangerously low levels if blood pressure is too high. C. Due to increased afterload, the left ventricle must contract more forcefully to expel the same amount of blood. D. Sodium concentration increases during high blood pressure and is toxic to the myocardium.
Which of the following is not part of the body’s nonspecific immunity?
a. antibodies b. the skin c. tears d. phagocytosis