The two major cations in the body are
A) calcium and sodium.
B) sodium and chloride.
C) chloride and bicarbonate.
D) sodium and potassium.
E) magnesium and chloride.
D) sodium and potassium.
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Epithelial cells are continually being shed from the villi because
a. the intracellular enzymes digest important cellular constituents, causing the cells to disintegrate and slough. b. the body needs a continual supply of protein derived from the digestion of these cells. c. new cells are continually being produced in the crypts at the base of the villi and migrate upward. d. acid entering the small intestine from the stomach constantly destroys the small intestinal lining, causing the cells to slough. e. none of these answers.
What type of motion is allowed by the shoulder joint?
What will be an ideal response?
Most gases and small ions are highly soluble in lipids and can, therefore, pass easily between phospholipid molecules in the plasma membrane
Indicate whether the statement is true or false
Which of the following structures is a capillary?
A. glomerulus B. loop of Henle C. collecting duct D. Bowman's capsule E. proximal convoluted tubule