Which statement best describes peristalsis?
peristalsis is voluntary, two-way movement.
peristalsis moves the food along the digestive tract.
peristalsis breaks down carbohydrates in the mouth.
peristalsis absorbs water and nutrients.

Which of the following statements about a typical plasma membrane is correct? a. the plasma membrane is a covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell. b. the two sides of the plasma membrane have different lipid and protein composition. c. the hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids. d. phospholipids are the primary component that determines which solutes can cross the plasma membrane. e. carbohydrates on the membrane surface are important in determining the overall bilayer structure.