Practice Exam 3

Functions of the stomach include all of the following, except denaturation of proteins. initiation of protein digestion. absorption of triglycerides. mechanical breakdown of food. storage of ingested food.

absorption of triglycerides.

In order for glycolysis to proceed, which of the following need not be present?

acetyl-CoA

During deglutition, A) the larynx elevates and the epiglottis closes. B) the lower esophageal sphincter opens. C) the soft palate elevates. D) all of the above

all of the above

Which of these enhance the absorptive effectiveness of the small intestine? the microvilli the villi the plicae circulares intestinal movements all of the above

all of the above

Each of the following is a function of the liver, except synthesis of plasma proteins. inactivation of toxins. antibody production. synthesis and secretion of bile. storage of glycogen and iron reserves.

antibody production.

In response to the arrival of acid chyme in the duodenum, the

blood levels of secretin rise.

Which of these descriptions best matches the term myenteric plexus?

coordinates activity of muscularis externa

A disease that attacks and disables the myenteric plexus would

decrease intestinal motility

21) Which of the following is classified as being either squamous or columnar?

digestive epithelium

Haustra are

expansible pouches of the colon.

Blockage of the common hepatic duct would interfere with digestion of

fats

27) In glycolysis, each molecule of glucose that is catabolized gives a net yield of how many molecules of ATP?

2

The pancreas produces nucleases. lipases and amylase. peptidases and proteinases. all of the above A and Bonly

A and Bonly

Parietal cells secrete

hydrochloric acid.

The part of the digestive tract that plays the primary role in the digestion and absorption of nutrients is the

jejunum

28) All of the following occur during the postabsorptive state, except that levels of blood glucose are elevated. fat mobilization occurs. gluconeogenesis occurs in the liver. ketone bodies may be formed. glycogenolysis occurs in the liver.

levels of blood glucose are elevated.

Movements unique to the large intestine are ________ movements.

mass

muscular contractions that propel the contents of the digestive tract are called

peristalsis

The enzyme amylase digests

polysaccharides

All of the following are true of the intestinal phase of gastric digestion, except that it precedes the gastric phase. helps ensure that the functions of the small intestine proceed with relative efficiency. involves both neural and endocrine reflexes. functions to control the rate of gastric emptying. begins when chyme enters the small intestine.

precedes the gastric phase.

The pancreas produces ________-digesting enzymes in the form of proenzymes.

protein

Lacteals

carry absorbed fats to the lymphatic system.

The absorption of some sugars in the small intestine involves

co-transport

The fusion of the hepatic duct and the cystic duct forms the

common bile duct.

Each of the following organs is a component of the digestive tract, except the pharynx. salivary gland stomach. colon. esophagus.

salivary gland

The intestinal hormone that stimulates the pancreas to release a watery, bicarbonate-rich fluid is

secretin

Which of these descriptions best matches the term gastrin?

stimulates gastric secretion

A stratified squamous epithelial lining can be found in all of the following, except in the

stomach

The carbon dioxide of respiration is formed during

the Krebs cycle

22) Which of these descriptions best matches the term duodenal ampulla?

where pancreatic juice and bile enter duodenum