A & P 2 Online CH 40
Brush border enzymes in saliva and pancreatic juice hydrolyze polysaccharides into disaccharides.
False (Amylase in saliva and pancreatic juice hydrolyze polysaccharides into disaccharides. Brush border enzymes in the lining of the small intestine then promote hydrolysis of the disaccharides into monosaccharides.)
Deglutition is synonymous with mastication.
False (Deglutition is synonymous with swallowing.)
Pepsin is an enzyme that assists with carbohydrate digestion.
False (Pepsin is an enzyme that assists with protein digestion.)
Lipase is a protein-digesting enzyme.
Lipase is a fat-digesting enzyme.
The action of bile on fat is emulsification, which is an example of "mechanical digestion."
True (Emulsification is a physical breakdown of fats—not an enzymatic breakdown—and is considered an example of mechanical digestion.)
Glucose is also called dextrose.
True (Glucose, or dextrose, is a monosaccharide, or simple sugar, and is the principal blood sugar.)
Monosaccharides and amino acids are absorbed into the blood in the intestinal capillaries.
True (Most absorbed substances enter the blood in intestinal capillaries, with the exception of fat, which enters lymph by way of the intestinal lacteals.)
The motility produced by smooth muscle is of two main types: peristalsis and segmentation.
True (Peristalsis is a wavelike ripple of the muscle layer of a hollow organ, and segmentation is a mixing movement. Segmentation occurs when digestive reflexes cause a forward and backward movement within a single region or segment of the gastrointestinal tract.)
Starch is a polysaccharide.
True (Starch is a polysaccharide that is digested with the assistance of the enzyme amylase.)
The amylase found in saliva digests little of the carbohydrates when food is in the mouth because we eat so rapidly.
True (Very little digestion of carbohydrates occurs before food reaches the small intestine because so many of us swallow our food so fast and gastric juice contains no carbohydrate-digesting enzymes.)
