The frequency of action potentials generated by the SA node is:
A. increased by parasympathetic stimulation.
B. decreased by sympathetic stimulation.
C. increased by acetylcholine.
D. increased by epinephrine.
E. increased by an increase in blood pressure.
D
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The enzyme catalase neutralizes hydrogen peroxide produced in hair follicles.
Answer the following statement true (T) or false (F)
Sorting and directing the finished products to their final destinations is basic function of the . Golgi stack
Indicate whether the statement is true or false
Choose the statement that accurately describes why catalysts are biologically necessary.
A. Catalysts increase the activation energy of large populations of molecules. B. Catalysts make reactions go faster without cellular damage that would occur from heat. C. Catalysts provide the heat necessary for molecules to reach activation energy. D. All cell processes would occur without catalysts, but catalysts optimize the reaction rates.
The potential difference is caused by a difference in concentration of charged particles on either side of the cell membrane.
a. true b. false