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Ch. 23 The Digestive System
Marieb - Human Anatomy & Physiology 11th Edition
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb, Hoehn 11th EditionCh. 23 The Digestive SystemProblema 11
Capitolo 23, Problema 11

Name the six functional activities of the digestive system.

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1
Understand that the digestive system performs several key functions to process food and absorb nutrients necessary for the body.
Identify the first functional activity: Ingestion, which is the process of taking food into the mouth.
Recognize the second activity: Propulsion, which includes swallowing and the movement of food through the digestive tract via peristalsis.
Note the third activity: Mechanical digestion, involving physical breakdown of food through chewing, churning, and segmentation.
List the remaining activities: Chemical digestion (breaking down food molecules by enzymes), Absorption (nutrients passing into the blood or lymph), and Defecation (elimination of indigestible substances as feces).

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Ingestion

Ingestion is the process of taking food into the mouth, initiating digestion. It involves chewing and swallowing, which prepare food for further breakdown in the digestive tract.
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Digestion

Digestion refers to the mechanical and chemical breakdown of food into smaller molecules. Mechanical digestion includes chewing and churning, while chemical digestion involves enzymes breaking down complex molecules.
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Absorption

Absorption is the process by which nutrients from digested food pass through the lining of the intestines into the bloodstream. This allows the body to utilize essential nutrients for energy, growth, and repair.
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Domanda del libro di testo

Trace the path of a single protein molecule that has been ingested.

The protein molecule will be digested by enzymes made by

a. The mouth, stomach, and colon

b. The stomach, liver, and small intestine

c. The small intestine, mouth, and liver

d. The pancreas, stomach, and small intestine

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Domanda del libro di testo

Which of the following is not characteristic of the colon?

a. It is divided into ascending, transverse, and descending portions

b. It contains abundant bacteria, some of which synthesize certain vitamins

c. It is the main absorptive site

d. It absorbs much of the water and salts remaining in the wastes

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Domanda del libro di testo

The sphincter between the stomach and duodenum is:

a. The pyloric sphincter

b. The gastroesophageal sphincter

c. The hepatopancreatic sphincter

d. The ileocecal valve

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Domanda del libro di testo

Someone has eaten a meal of buttered toast, cream, and eggs. Which of the following would you expect to happen?

a. Compared to the period shortly after the meal, gastric motility and secretion of HCl decrease when the food reaches the duodenum

b. Gastric motility increases even as the person is chewing the food (before swallowing)

c. Fat will be emulsified in the duodenum by the action of bile

d. All of these

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Domanda del libro di testo

The gallbladder

a. Produces bile

b. Is attached to the pancreas

c. Stores and concentrates bile

d. Produces secretin

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Domanda del libro di testo

a. What is the normal number of permanent teeth? Of deciduous teeth?

b. What substance covers the tooth crown? Its root?

c. What substance makes up the bulk of a tooth?

d. What and where is pulp?

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