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    Small Intestine

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    Gaurav Singh
    The small intestine secretes intestinal juice containing water, electrolytes, and digestive enzymes like enterokinase, peptidases, disaccharidases, and intestinal lipases to break down carbohydrates, proteins, lipids, and nucleic acids. It also secretes mucus. Absorption in the small intestine is regulated by local nervous reflexes, vagal stimulation, and hormones like vasoactive intestinal peptide, prostaglandins, acetylcholine, and secretin. The main functions of the small intestine are to further break down nutrients through segmentation and peristalsis; absorb around 90% of nutrients and water through the mucosa; and propel digesta through the small intestine.

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    Small Intestine

    Uploaded by

    Gaurav Singh
    171 views10 pages
    The small intestine secretes intestinal juice containing water, electrolytes, and digestive enzymes like enterokinase, peptidases, disaccharidases, and intestinal lipases to break down carbohydrates, proteins, lipids, and nucleic acids. It also secretes mucus. Absorption in the small intestine is regulated by local nervous reflexes, vagal stimulation, and hormones like vasoactive intestinal peptide, prostaglandins, acetylcholine, and secretin. The main functions of the small intestine are to further break down nutrients through segmentation and peristalsis; absorb around 90% of nutrients and water through the mucosa; and propel digesta through the small intestine.

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    The small intestine secretes intestinal juice containing water, electrolytes, and digestive enzymes like enterokinase, peptidases, disaccharidases, and intestinal lipases to break down carbohydrates, proteins, lipids, and nucleic acids. It also secretes mucus. Absorption in the small intestine is regulated by local nervous reflexes, vagal stimulation, and hormones like vasoactive intestinal peptide, prostaglandins, acetylcholine, and secretin. The main functions of the small intestine are to further break down nutrients through segmentation and peristalsis; absorb around 90% of nutrients and water through the mucosa; and propel digesta through the small intestine.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    171 views10 pages

    Small Intestine

    Uploaded by

    Gaurav Singh
    The small intestine secretes intestinal juice containing water, electrolytes, and digestive enzymes like enterokinase, peptidases, disaccharidases, and intestinal lipases to break down carbohydrates, proteins, lipids, and nucleic acids. It also secretes mucus. Absorption in the small intestine is regulated by local nervous reflexes, vagal stimulation, and hormones like vasoactive intestinal peptide, prostaglandins, acetylcholine, and secretin. The main functions of the small intestine are to further break down nutrients through segmentation and peristalsis; absorb around 90% of nutrients and water through the mucosa; and propel digesta through the small intestine.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 10

    PHYSIOLOGY OF SMALL INTESTINE

    SMALL INTESTINE

    STRUCTURAL CHARACTERISTICS OF SI

    SECRETIONS OF THE SMALL INTESTINE

    1. 2.

    Intestinal juice / Succus entericus


    The intestinal secretions are formed by the enterocytes of the crypts. Rate of about 1800 ml/day. These Secretions are almost pure extracellular fluid. Have a slightly alkaline pH in the range of 7.5 to 8.0. Colorless ,but slightly cloudy. Include : Aqueous component (Water (98.4%) & electrolytes) Intestinal enzymes (Enterokinase , peptidases , disaccharidases & intestinal lipases)

    3.

    Mucus

    ELECTRONEUTRAL NACL ABSORPTION IN THE


    SMALL
    INTESTINE

    Chloride and Bicarbonate secretion in the small intestine

    REGULATION OF SI SECRETIONS
    1.

    Local enteric nervous reflexes :

    - Mechanical : distension , tactile stimuli


    - Chemical : irritative stimuli from the chyme Role of VIP, PGs ,Ach & Secretin Vagal stimulation

    2.

    3.

    FUNCTIONS OF THE SMALL INTESTINE


    1.

    Segmentations mix chyme with digestive juices and bring food into contact with mucosa for absorption; peristalsis propels chyme through small intestine.

    2.

    Completes digestion of carbohydrates, proteins, and lipids.

    3. 4.

    Begins and completes digestion of nucleic acids.

    Absorbs about 90% of nutrients and water that pass


    through digestive system.

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