Digestion and Absorption - Chapter 40
The mechanical process that occurs in the rectum is churning?
False
Water is readily absorbed in the stomach.
False
Bilirubin is the result of hemolysis by the liver
True
Celluloses resists digestion and is eliminated in feces
True
Mechanical digestion begins in the mouth?
True
Pepsinogen is converted into pepsin by hydrochloric acid
True
Segmentation is a mixing movement
True
The hormones secretin and CCK stimulate ejection of bile
True
Which of the following is not true concerning the gastric emptying of water?
Warm fluids empty more quickly than cool fluids.
A micelle is
a tiny sphere of lipid and water
The principal enzyme of saliva is
amylase
Polysaccharides are hydrolyzed to disaccharides by enzymes known as
amylases
Which of the following substances does not contain any enzymes?
bile
The process of fat emulsification consists of
breaking down fats into small droplets.
The hormone that stimulates the gallbladder to release bile is
cholecystokinin
The union of the cystic duct and hepatic duct form the
common bile duct
Movement of lower colon and rectum contents at a rate slower than normal can cause
constipation
The process of swallowing is known as
deglutition
Olfactory and visual stimuli are factors concerning the control of
digestive gland secretion
Peristalsis begins in the
esophagus
Most digestive enzymes are synthesized and secreted as inactive knases
false
Fats are broken down into
fatty acids
During the process of digestions, stored bile is poured into the duodenum by which of the following?
gallbladder
Which of the following is not a state of deglutition
gastric
Which of the following is a simple sugar?
glucose
Fats are absorbed primarily into which of the following structures:
lymph in intestinal lacteals
The final product of carbohydrate digestion is a
monosaccharide
Which step of deglutition is under voluntary control?
oral
Enzymes are _______
organic catalysts
Which of the following describes the pharyngeal state of deglutition?
oropharynx to esophagus
Pancreatic juice is secreted by exocrine acinar cells of the
pancrease
Which blood vessel carries absorbed nutrients from the GI tract to the liver
portal vein
Enzymes that catalyze the hyrolysis of proteins are
proteases
The enzyme pepsin is concerned primarily with the digestion of which of the following?
proteins
The majority of substances are absorbed in the
small intestine
The enzyme amylase converts which of the following?
starches and sugars
Impaired fat absorption produces large, greasy, foul-smelling stools known as
steatorrhea
Protein digestion begins in the
stomach
The portion of the alimentary canal that mixes food with gastric juice and breaks it down into a mixture called chyme is the:
stomach
Which of the following present in bile?
Lecithin and bile salts
_______ is liquefied food found in the stomach
Chyme
Which hormone decreases peristalsis and slows the passage of food from the stomach to the duodenum
GIP
