The Digestive system

  1. What 4 things do we need food for?
    • 1) Energy for cells 
    • 2) Storage of energy 
    • 3) Production of heat 
    • 4) Growth and repair
  2. What are 3 essential nutrient?
    • Protein 
    • carbs
    • fats (lipids)
  3. What are the three components of the digestive system?
    • 1) Digestive process 
    • 2) Alimentary canal or GI tract 
    • 3) Accessory organs of digestion
  4. What are the 5 digestive processes?
    • 1) Ingestion 
    • 2) Propulsion 
    • 3) Digestion 
    • 4) Absorption 
    • 5) Elimination
  5. What does ingestion do?
    Takes food into alimentary canal (from mouth to anus)
  6. What does propulsion do?
    Mixing/ moving food along canal
  7. What does digestion do?
    mechanical and chemical digestion
  8. What does absorption do?
    Digested substances from food enter blood/lymph vessels
  9. What does elimination do?
    Excretion of waste
  10. The nerves are supplied to the GI tract by what system?
    autonomic nervous system (involuntary)
  11. What 4 things does the parasympathetic nervous system do?
    • 1) Rest and digest 
    • 2) Increase peristalsis 
    • 3) Increases gland secretion (gastric juice + enzymes) 
    • 4) Increases saliva
  12. What does the sympathetic nervous system do?
    • 1) fight or flight
    • 2) reduces peristalsis and secretion
  13. What is the alimentary tract or GI tract?
    Actively transports the flow of food through the whole of the digestive process.
  14. Name 3 parts of the oral cavity that aid in digestion?
    • Tongue- propels food bolus into oesophagus
    • Teeth- Chewing breaks down food (mechanical digestion) 
    • Salivary glands- saliva contains enzymes which begin chemical digestion
  15. Name the 3 parts of the Pharynx
    • Nasopharynx 
    • oropharynx 
    • laryngopharynx
  16. What is the epiglottis?
    • leaf shaped plate of yellow fibro elastic cartilage. 
    • located at entrance to larynx 
    • prevents food going down the larynx during swallowing
  17. what is the oesophagus? (4 things)
    • collapsible muscular tube 
    • descends from pharynx to cardiac sphincter in stomach 
    • 25cm long, 2 cm in diameter
    • movement of food bolus along it by peristalsis
  18. what is the oesophagus made up of?
    • Smooth muscle 
    • elastic tissue 
    • mucous membrane
  19. what is peristalsis?
    • helps food move through the system 
    • by rhythmic, muscular contraction of the walls 
    • pushes food in one direction
  20. What is the anatomy of the stomach?
    • Muscular bag like organ 
    • walls lined with mucous membrane 
    • contains cardiac sphincter- connection with oesophagus which prevents regurgitation
  21. What 2 types of digestion happen in the stomach?
    • Mechanical digestion- stomach contracts to help churn up food. 
    • chemical digestion- mixes gastric juices, hydrochloric acid and enzymes to liquefy
  22. What is liquefied food called?
    Chyme
  23. What sphincter prevents regurgitation back into the stomach from the duodenum?
    Pyloric sphincter
  24. What is the duodenum?
    • first part of small intestine 
    • bile and pancreatic duct empty into duodenum 
    • chemical digestion of carbs, protein and fats occur across the small intestine 
    • 25 cm long
  25. Where does the chemical digestion of carbs, protein and fats take place?
    Duodenum
  26. Where do the bile and pancreatic ducts empty?
    Duodenum
  27. What is the small intestine?
    Muscular tubes lined with connective tissue and mucous membrane
  28. what is the small intestine comprised of?
    • Duodenum 
    • Jejunum 
    • Ileum
  29. Where does most water absorption happen?
    Small intestine
  30. where does the small intestine join the large intestine?
    Ileum
  31. What is the outer covering if the small intestine called?
    Peritoneum
  32. Why does the small intestine have a large surface area?
    • Digestion 
    • absorption
  33. What passes through the inner lining of the small intestine and where is it absorbed?
    • nutrients 
    • blood vessels in the wall of the intestine
  34. what does the large intestine do?
    • absorbs electrolytes and vitamins 
    • storage & expulsion of faeces
  35. How long is the L intestine ?
    1.5 m
  36. What are the 5 main parts to the L intestine?
    • Ascending colon
    • transverse colon
    • descending colon
    • sigmoid colon
    • rectum
  37. What is the peritoneum?
    • serous membrane- lines abdominal cavity 
    • 2 layers which cover abdominal cavity 
    • prevents friction with serous fluid 
    • attaches organs to posterior abdominal wall
    • carries blood vessels that help fight infection
  38. What 3 organs also produce the chemicals necessary for digestion?
    • salivary glands 
    • liver 
    • pancreas
  39. What are 7 functions of the liver?
    • carbs, fats and protein metabolism 
    • processing of drugs and hormones 
    • excretion of bilirubin 
    • produces bile
    • storage of vitamins and minerals 
    • phagocytosis- RBC's, WBC's and some bacteria 
    • highest heat producing organ in the body
  40. what does the gall bladder & bile do?
    • helps digest fat to aid absorption 
    • stores and concentrates bile 
    • releases bile into the small intestine
  41. Which part of the small intestine is bile released into?
    duodenum
  42. How long is the pancreas? and where is it?
    • 12-15 cm 
    • mainly lies behind stomach
  43. What does exocrine mean in relation to pancreas?
    secretes enzymes (pancreatic) directly into duodenum- digest carbs, fats and proteins
  44. What does endocrine mean in relation to pancreas?
    Secretes hormones (insulin and glucagon) directly into the blood to control blood glucose levels.
Author
davidgoddard93
ID
344791
Card Set
The Digestive system
Description
The Digestive system revision
Updated