Digest Review questions
Arrange the following in proper sequence as they occur first in the body (1) Digestion (2) Elimination (3) Ingestion (4) Absorption
3, 1, 4, 2
The formation of HC1 in the stomach involves the
Active transport of H+ from parietal cells into the lumen of the stomach
Which of the following are secreted by the stomach? A. Amylase and lipase B. Pepsinogen and intrinsic factor C. Bile and lipase D. Trypsin and amylase E. Bicarbonate and secretin
B. Pepsinogen and intrinsic factor
Which of the following is a function of the digestive system? A. Cellular respiration B. Food selection C. Elimination of undigested food D. Regulation of blood pH
C. Elimination of undigested food
Which of the following is an accessory organ of the digestive tract? A. Pharynx B. Stomach C. Liver D. Large intestine
C. Liver
Anticipation of eating food causes an increase in secretion of gastric juice. This phase of gastric secretion is called the _____ phase.
Cephalic
Food in the stomach is squeezed and mixed with gastric juices, forming a semiliquid called
Chyme
The hepatopancreatic ampulla is formed by the union of the
Common bile duct and pancreatic duct
The muscularis layer in the wall of the digestive tract is
Composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers
What is the function of the enteric sensory neurons?
Detect changes in chemical composition of digestive tract contents and detect stretch of the digestive tract wall
Which of the following will stimulate intestinal motility
Distension of the intestinal wall
Which portion of the small intestine is most distal from the pylorus of the stomach?
Ileum
Secretions that are added as food moves through the GI tract assist in
Liquefying and digesting the food
The pylroic pump
Moves chyme through a partially closed pyloric opening
Which of the following represents a mismatch in stomach wall structure?
Muscularis - two layers; both circular
Which of the following events occur because of the low pH of the stomach?
Proper environment for functioning of pepsin
A mixing contraction in the small intestine is called _______?
Segmental contraction
What is the role of serotonin in the digestive tract?
Stimulate motility
Where does the majority of nutrient absorption occur?
The jejunum and duedenum
Why doesn't the stomach digest itself?
The stomach wall is protected by large amounts of mucus.
Parasympathetic nerves extend to the digestive tract through the ______ nerve.
Vagus
Blockage of the ileocecal valve would prevent
chyme from entering the large intestine.
The villi, microvilli, and plicae circularis function to
increase surface area for absorption