Epithelial cells are continually being shed from the intestinal villi because
a. the intracellular enzymes cause the cells to disintegrate and slough off
b. the body needs a continual supply of protein derived from the digestion of these cells
c. new cells are produced continually in the crypts and then they migrate upward
d. acid entering the small intestine constantly destroys the villi, causing the cells to slough
e. of factors other than those mentioned above
C
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The chemical symbol O=O means ________
A) the atoms are double bonded B) both atoms are bonded and have zero electrons in the outer orbit C) zero equals zero D) this is an ionic bond with two shared electrons
____________________ matter consists predominantly of densely packaged cell bodies and dendrites, whereas ____________________ matter consists of bundles of myelinated nerve fibers
Fill in the blank(s) with correct word
Secretory vesicles are released to the exterior of the cell by means of the process of phagocytosis
Indicate whether the statement is true or false
membrane invagination followed by formation of a membrane enclosed vesicle in the cytoplasm
What will be an ideal response?