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Anatomy and Physiology of the Intestines Study Guide

This guide provides a comprehensive overview of the digestive system's role in breaking down food into absorbable nutrients. It details the mechanical and chemical processes involved, the specific enzymes and mechanisms for digesting major macromolecules (carbohydrates, proteins, lipids, nucleic acids), and how these nutrients are absorbed and transported throughout the body via blood and lymph. Key concepts include hydrolysis, enzyme action, various transport mechanisms (active, passive, facili

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Digestive System Processes, Anatomy, and Nutrient Absorption

Digestive System Processes and Regulation

The digestive system performs six fundamental activities including ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation through neural and hormonal controls.

  • ingestion
  • propulsion
  • peristalsis
  • mechanical digestion
  • mastication
  • segmentation
  • chemical digestion
  • absorption
  • defecation
  • neural controls
  • hormonal controls
  • gastrin
  • secretin
  • cholecystokinin

Anatomy and Physiology of Intestines

The small and large intestines facilitate chemical digestion and the absorption of nutrients through specialized structures like villi and microvilli.

  • small intestine anatomy
  • large intestine anatomy
  • duodenum
  • digestive enzymes
  • carbohydrate digestion
  • protein digestion
  • nucleic acid digestion
  • fat digestion
  • microvilli
  • brush border
  • nutrient absorption
  • lacteals
  • chylomicrons
  • segmentation
  • chyme

Accessory Organs in Digestion

The liver, pancreas, and gallbladder serve as accessory digestive organs that produce, store, and release bile, digestive enzymes, and bicarbonate ions.

  • Accessory digestive organs
  • Liver histology
  • Bile composition
  • Emulsification of fats
  • Pancreatic juice
  • Bicarbonate ions
  • Exocrine and endocrine pancreas
  • Gallbladder bile storage

Digestion and Absorption of Nutrients

Nutrient molecules are broken down through hydrolysis and absorbed into the bloodstream or lacteals via various mechanisms.

  • mechanical and chemical digestion
  • hydrolysis
  • carbohydrate digestion
  • salivary amylase
  • protein digestion
  • amino acids
  • lipid digestion
  • lipases
  • nucleic acid digestion
  • pancreatic nucleases
  • monosaccharides
  • active transport
  • passive diffusion
  • facilitated diffusion
  • cotransport
  • endocytosis
  • lipid absorption
  • chylomicrons

Anatomy and Physiology of the Digestive System

Anatomy and Functions of the Mouth, Pharynx, and Esophagus

This content covers the anatomy and digestive functions of the mouth, salivary glands, teeth, tongue, pharynx, and esophagus during mastication and deglutition.

  • Mouth anatomy
  • Mastication
  • Tongue functions
  • Saliva composition
  • Salivary enzymes
  • Salivary gland regulation
  • Deciduous and permanent teeth
  • Tooth structure
  • Pharynx anatomy
  • Esophagus functions
  • Esophageal sphincters
  • Peristalsis
  • Deglutition phases

Overview of the Digestive System

The digestive system consists of the alimentary canal and accessory organs responsible for the mechanical and chemical breakdown of food, ingestion, propulsion, digestion, absorption, and defecation.

  • Alimentary canal
  • Accessory digestive organs
  • Mechanical digestion
  • Chemical digestion
  • Ingestion
  • Propulsion
  • Absorption
  • Defecation
  • Small intestine
  • Peritoneum
  • Enteric nervous system
  • Autonomic nervous system
  • Salivary glands
  • Liver
  • Pancreas
  • Gallbladder

Histology and Innervation of the Alimentary Canal

The alimentary canal is composed of four tissue layers and is regulated by the enteric and autonomic nervous systems and the peritoneum.

  • mucosa
  • submucosa
  • muscularis
  • enteric nervous system
  • submucosal plexus
  • myenteric plexus
  • autonomic nervous system
  • parasympathetic impulses
  • sympathetic impulses
  • peritoneum
  • parietal peritoneum
  • visceral peritoneum
  • peritoneal cavity

Anatomy and Physiology of the Stomach

The stomach is an expansion of the alimentary canal that performs mechanical and chemical digestion through gastric juice secretion and muscular contractions.

  • Stomach regions
  • Gastric glands
  • Mechanical digestion
  • Chemical digestion
  • Gastric juice
  • Parietal cells
  • Chief cells
  • Mucous neck cells
  • Enteroendocrine cells
  • Hydrochloric acid
  • Gastrin
  • Histamine
  • Serotonin
  • Somatostatin
  • Cephalic phase
  • Gastric phase
  • Intestinal phase
  • Enterogastric reflex

Anatomy and Physiology of the Large Intestine

The large intestine is the last part of the GI tract subdivided into the cecum, colon, rectum, and anus which absorbs salts and water.

  • cecum
  • colon
  • rectum
  • ileocecal valve
  • chyme
  • simple columnar epithelium
  • goblet cells
  • teniae coli
  • epiploic appendages
  • haustral contractions
  • mass movements
  • gastrocolic reflex
  • defecation reflex
  • anal sphincters
  • feces

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