When we ingest large molecules such as lipids, carbohydrates, and proteins, they must undergo catabolic reactions whereby enzymes split these molecules. This series of reactions is called ________.
A) mechanical breakdown
B) absorption
C) secretion
D) chemical digestion
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Question 2) The chemical and mechanical processes of food breakdown are called ________.
A) secretion
B) ingestion
C) absorption
D) digestion
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Question 3) The protective outermost layer of the esophagus is the ________.
Fill in the blanks with correct word
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Question 4) The function of the hepatic portal circulation is to ________.
A) return glucose to the general circulation when blood sugar is low
B) carry toxins to the kidney for disposal through the urinary tract
C) distribute hormones throughout the body
D) collect absorbed nutrients for metabolic processing in the liver
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Question 5) The mechanical and chemical receptors that control digestive activity are located ________.
A) in the walls of the tract organs
B) in the glandular tissue that surround the organ lumen
C) in the oral cavity
D) in the pons and medulla
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Question 6) The ________ phase of gastric secretions occurs when food enters the stomach.
Fill in the blanks with correct word
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Question 7) Proteins entering the stomach act as a buffer raising pH. Rising pH stimulates the activity of G-cells in the lining of the stomach. All of the following but one will occur. Select the statement below that would not occur.
A) More stomach acid will be produced and secreted.
B) A positive feedback response will be initiated and G-cell activity will continue to go up.
C) Protein digestion will be enhanced.
D) Digestive enzymes will be released.
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Question 8) The ________ ligament anchors a tooth in the alveolus of the jaw.
Fill in the blanks with correct word
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Question 9) Select the one response below that would not result from a drug that blocks histamine receptors in the cells lining the stomach.
A) It would reduce the symptoms of heartburn.
B) It would cause the release of secretin and cholecystokinin.
C) It would lower the activity of parietal cells.
D) It would raise the pH of the stomach.
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Question 10) The part of the peritoneum that covers the external surfaces of most digestive organs is the ________ peritoneum.
Fill in the blanks with correct word
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