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Summary BIOL 171 Midterm Study Guide

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DIGESTIVE SYSTEM
Which of the following does not contribute to that digestion of proteins? Amylase.

Short chain triglycerides, found in food such as butterfat molecules in milk are split by a specific enzyme
in preparation for absorption. Which of the following enzymes is responsible? Lipase.

What is one main function of the small intestines? Absorption of nutrients.

Where does protein digestion begin? Stomach.

Which of the following is not a function of cholecystokinin (CCK)? Increase production of stomach acid.

Which of the following is not a characteristic of the large intestines? It is longer than the small intestines.

The bolus is liquefied in the stomach, and it is now called chyme.

Bile salts break up the fat globule into smaller fat droplets. This role of bile salts is best described as lipid
emulsification.

Which one of the following represents the correct order through which food passes in the alimentary
canal? Mouth, pharynx, esophagus, stomach, small intestine, large intestine.

Digestion is primarily controlled by the parasympathetic division of the autonomic nervous system.

Gastric juice can build up from the stomach into the esophagus and cause heartburn. What sphincter,
weakened by a hiatal hernia, can contribute this condition? Cardio esophageal Sphincter (lower
esophageal sphincter)

Chemical digestion reduces large complex molecules to simpler compounds by the process of
catabolism.

All but one of the following is a function of the low pH found in the stomach. Select the description
below that does not reflect the role of the stomach acid. The stomach acid catabolically breaks down
food stuffs in preparation for absorption.

Generally, the hormones secretion and cholecystokinin which are released by duodenal
enteroendocrine cells will increase the release of digestion enzymes and bile.

Which of the following is continuous with the esophagus? Laryngopharynx.

What organ stores bile when food digestion is not occurring? Gallbladder.

Which of the following enzymes would be most active in the presence of high concentrations of protein
fragments? Trypsin

Hydrochloric acid is necessary in the stomach for the conversion of pepsinogen into its active protein
digesting form called pepsin.

, You have just eaten a meal in complex carbohydrates. Which of the following enzymes will help to digest
the meal? Amylase.

When we ingest large molecules, such as a lipids, carbohydrates, and proteins, they must undergo
catabolic reactions whereby enzymes split these molecules. This series of reactions is called chemical
digestion.

Jaundice indicates the bio has backed up into the liver rather than entering the small intestine.

The ducts that delivered bile and pancreatic juice from the liver and pancreas, respectively, unit to form
the hepatopancreatic ampulla.

Which set of salivary glands are situated interior to the ear? Parotid glands.

The process by which larger molecules or structures are built up from smaller ones is called anabolism.

Some antacid, drugs block histamine receptors, resulting in reduction of the product production and
excretion of stomach acid. These drugs have the biggest effect on which of the following? Parietal cells.

What organs release secretions into the duodenum of the small intestine? Liver, gallbladder, and
pancreas.

Which tissue layer contributes to the creation of the mesentery? Serosa.

Pepsinogen, and inactive digestive enzyme, is secreted by the chief cells of the stomach.

Deep folds of both the mucosa and sub mucosa in the small intestines that increased surface are known
as circular folds (plicae circulares).

Bile is formed by the liver and stored in the gallbladder.

Nutrition

What is the outcome of ketosis? Metabolic acidosis.

When proteins undergo deamination, the waste substance found in the urine is mostly urea.

Which of the following is a normal consequence of the activation of the heat promoting center? Release
of epinephrine.

Glycogen is formed in the liver during the absorptive state.

At the conclusion of glycolysis, most of glucoses chemical energy is found in the pyruvic acid molecules.

Several hours after you eat your last meal blood glucose levels, stimulate release of the hormone
glucagon, which stimulates glycogenolysis, lipolysis and fat mobilization, and gluconeogenesis.

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