Action potentials in the heart spread from cell to cell through
A. gap junctions.
B. valves.
C. interneurons.
D. coronary vessels.
E. desmosomes.
Answer: A
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The __________________ axis is the imaginary line around which sagittal plane motion occurs.
Fill in the blank(s) with the appropriate word(s).
The renal buffering system helps maintain acid-base balance through:
a. Excretion of ammonium ions b. Excretion of bicarbonate c. Recovery of hydrogen ions d. Recovery of sodium
The movement of molecules from an area of high concentration to an area of low concentration is known as a. passive diffusion. b. facilitated diffusion
c. active transport. d. pinocytosis/phagocytosis.
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.