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