Chemical energy
A. is not important in physiological processes.
B. results from the position or movement of objects.
C. is a form of potential energy within chemical bonds.
D. comes from the sun.
E. moves matter.
Answer: C
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Design a flow chart or concept map to summarize the information in the text under the heading "Cell-to-Cell Communication." This chart should make clear the four basic methods of cell-to-cell communication, and the relevance of and distinction between paracrine, autocrine, neurocrine, and cytokine chemicals.
What will be an ideal response?
An incompetent mitral valve may cause blood to back up into the
A. aorta. B. left atrium. C. left ventricle. D. coronary circulation. E. right atrium.
Tight junctions between ________ are responsible for the formation of the blood-testis barrier.
A. Sertoli cells B. spermatogonial cells C. trophoblast cells D. Leydig cells