بسم هللا الرحمن الرحيم

بسم اهلل الرحمن الرحيمGastro-Intestinal

Physiology

(G.I.Phy.)

BY: B.RAHMATI

Physiology Dept.,

Medical School,

Shahed Univ.

• Regulatory Process in the G.I.tract

• Gastrointestinal Motility

• Gastrointestinal Secretions

• Digestion and Absorption

Regulatory process

• Regulatory Peptides

• Autonomic Nervous System (A.N.S.)

• Smooth Muscle Contraction

Regulatory peptides

• Endocrine

• Paracrine

• neurocrine

Autonomic Nervous System (A.N.S.)

• Extrinsic A.N.S.

Parasympathetic Innervations

Sympathetic Innervations

• Intrinsic A.N.S. (Enteric N.S.)

Myenteric

Submucosal

Smooth Muscle Contraction

• Phasic

• Tonic

Anatomical Features of Smooth

Muscle

• Unitary (visceral)

• Multiunit

Gastrointestinal Motility

• Swallowing

• Gastric Motility

• Motility of the Small Intestine

• Motility of the Large Intestine

• Gastrointestinal Reflexes

Swallowing

• Oral and Pharyngeal Events

• Esophageal Peristalsis

• Receptive Relaxation of the Stomach

• Swallowing Regulation

Gastric Motility

• Receptive Relaxation

• Gastric Peristalsis

• Gastric Emptying

Motility of the Small Intestine

• Segmentation Movements

• Peristalsis Movements

• MMC: Migrating Myoelectric Complex

Motility of the Large Intestine

• Segmentation Movements

• Peristaltic Movements

• Mass Movements

Gastrointestinal Reflexes

• Defecation Reflex

• Gastro-Ileal Reflex

• Ileo- gastric Reflex

• Intestino-Intestinal Reflex

• Salivary Secretions

• Gastric Secretions

• Pancreatic Secretions

• Bile Production, Secretion, and Storage

Gastrointestinal Secretion

Salivary Secretions

Gastric Secretions

Pancreatic Secretions

Bile Production, Secretion, and

Storage

Digestion and Absorption

• Carbohydrate Digestion and Absorption

• Protein Digestion and Absorption

• Lipids Digestion and Absorption

• Fluid and Electrolyte Absorption

Carbohydrate Digestion and

Absorption

Protein Digestion and Absorption

Lipids Digestion and Absorption

Fluid and Electrolyte Absorption