What governs the speed of a reaction?
A. The temperature of the reaction
B. The presence of a catalyst
C. The concentration of reactants
D. All of these are correct.
Answer: D
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The cardiovascular system is a control center for virtually all the body's organs.
Answer the following statement true (T) or false (F)
After axonal injury, regeneration in peripheral nerves is guided by ________
A) Schwann cells B) Wallerian cells C) Golgi organs D) dendrites
When a skeletal muscle fiber contracts, which of the following does not occur?
A) The H bands and I bands get smaller. B) The zones of overlap get larger. C) The Z lines get closer together. D) The width of the A band remains constant. E) Myosin and actin filaments decrease in length.
Which of the following describes an antiport system on the basal side of renal tubule cells?
A. It transports CO2 from the blood into the tubule cells. B. It transports bicarbonate from the tubular fluid back into the tubule cells. C. It transports H+ in both directions across the epithelium. D. It exchanges K+ for Na+. E. It exchanges H+ for Na+.