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Enzymes › View

What is the role of inhibitors in enzyme reactions?

A. Inhibitors increase the rate of enzyme reactions

B. Inhibitors decrease the rate of enzyme reactions

C. Inhibitors denature enzymes

D. Inhibitors have no effect on enzyme reactions

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Circulation and Excretion › View

Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?

A. changing force of the contraction of the heart

B. constricting and relaxing sphincters in the walls of arterioles

C. adjusting the volume of the blood in the veins

D. all the above

E. only a and b

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