Human Body, Digestion, and Absorption

Background

Organ System Components Function
Integumentary Skin, hair, nails Protection
Skeletal Bones Support/Movement
Nervous Brain, spinal cord, nerves, sense organs Metabolism
Muscular Muscles Movement
Endocrine Pituitary, Thyroid, Parathyroid, Pineal, Thymus, Adrenal, Pancreas, Ovary, and Testis Metabolism
Cardiovascular Heart, blood, blood vessels Transport
Lymphatic Lymph vessels and lymph nodes Transport
Respiratory Nose, Trachea, Lungs Transport
Digestive Mouth, Esophagus, Stomach, Pancreas, Gall Bladder, Intestines, and Colon Transport/Metabolism
Urinary Kidneys, Ureters, Bladder, and Urethra Waste Processing and Elimination
Reproduction Gonads Propagation

Digestive System Overview Diagram

Alimentary Canal

Accessory Organs

Digestive Process Diagram

  1. Ingestion
  2. Propulsion (swallowing and peristalsis)
  3. Mechanical Digestion (chewing, churning, segmentation)
  4. Chemical Digestion (acid and enzymes)
  5. Absorption (lymph and blood vessels)
  6. Defecation

Absorption of Nutrients

  1. Passive movements (diffusion, osmosis, and facilitated diffusion)
  2. Active Movements (active transport, endocytosis, and exocytosis)
  3. Question: how long does it take for food to move through the body (i.e. mouth to anus)?

Regulation of the Digestive and Absorptive Process Diagram

i. Digestive activity is provoked by a range of mechanical and chemical stimuli

ii. Controls of digestive activity are both extrinsic and intrinsic

Chemical Digestion

Carbohydrates

Proteins

Fats

Nucleic acids

Clinical Related problems with the Digestive System