HUMAN DIGESTIVE SYSTEM Celeste Roderno-Desingaño
-System with complex tubes of considerable length   -Also called the alimentary tract    -This group of organs that break ...
Parts of the Digestive System
1. Oral Cavity - this is where food is mixed with the saliva secreted by several sets of salivary glands - Saliva dissolve...
Teeth  - This is where  food is broken into smaller pieces by both biting and chewing. Tongue - manipulates the food durin...
2. Esophagus - a long tube running through the throat and thorax and connecting to stomach in the upper portion of the abd...
Peristalsis in the Esophagus
3. Stomach - This is a large muscular sac, which functions as a storage organ, making discontinuous feeding possible.  Rug...
<ul><li>4. Small Intestine </li></ul><ul><li>This is where final digestion and absorption takes place </li></ul><ul><li>Me...
5. Large Intestines - also known as  colon - Reabsorbs much of the water used in the digestive process and excretes certai...
<ul><li>6. Anus </li></ul><ul><li>- opening for the elimination of feces. </li></ul>Parts of the Digestive System
<ul><li>Liver </li></ul><ul><ul><li>Largest gland in the body </li></ul></ul><ul><ul><li>Aids in chemical digestion by pro...
<ul><li>Pancreas </li></ul><ul><ul><li>Large glandular organ lying just below the stomach </li></ul></ul><ul><ul><li>Secre...
<ul><li>Enzymes secreted by Pancreas  </li></ul><ul><li>Lipase  – enzyme that digest fats or splits fat into soluble glyce...
<ul><li>Intestinal Glands </li></ul><ul><ul><li>Completes the digestion of food. </li></ul></ul><ul><ul><li>1.  Peptidase ...
Digestive Flow ORAL CAVITY ESOPHAGUS STOMACH SMALL INTESTINE LARGE INTESTINE RECTUM ANUS
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DIGESTIVE SYSTEM

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DIGESTIVE SYSTEM

  1. 1. HUMAN DIGESTIVE SYSTEM Celeste Roderno-Desingaño
  2. 2. -System with complex tubes of considerable length -Also called the alimentary tract -This group of organs that break down food into smaller particles or molecules -This breakdown makes it possible for the smaller digestive particles to pass through the intestinal wall into the bloodstream - Particles are then distributed to nourish all parts of the body Digestive System
  3. 3. Parts of the Digestive System
  4. 4. 1. Oral Cavity - this is where food is mixed with the saliva secreted by several sets of salivary glands - Saliva dissolves and softens food and acts as a lubricant, facilitating swallowing and passage through the next portions of the digestive tract. Parts of the Digestive System
  5. 5. Teeth - This is where food is broken into smaller pieces by both biting and chewing. Tongue - manipulates the food during chewing and forms it into a mass called bolus , in preparation for swallowing. -Pushes the bolus through a cavity called the pharynx and into esophagus. Parts of the Digestive System
  6. 6. 2. Esophagus - a long tube running through the throat and thorax and connecting to stomach in the upper portion of the abdominal cavity. Peristalsis – contraction movement of esophagus muscle Sphincter – special ring of muscle found on the junction between esophagus and stomach, which when contracted closes the entrance to the stomach. Parts of the Digestive System
  7. 7. Peristalsis in the Esophagus
  8. 8. 3. Stomach - This is a large muscular sac, which functions as a storage organ, making discontinuous feeding possible. Rugae – folds of the stomach that increases its surface area. - churns the food, mixing it with the gastric juice Gastric Juice – contains enzymes that break down protein Chyme -soupy mixture that leaves the stomach and passes through the pyloric sphincter into the small intestines. Parts of the Digestive System
  9. 9. <ul><li>4. Small Intestine </li></ul><ul><li>This is where final digestion and absorption takes place </li></ul><ul><li>Measures 23 ft long in an adult </li></ul><ul><li>Duodenum – first section of the small intestines attached to the stomach </li></ul><ul><li>Jejunum – middle portion of the intestine </li></ul><ul><li>I leum – very long coiled section lying lower in the abdominal cavity </li></ul><ul><li>Villi – Finger-like projections in the inner wall of the small intestine that increases absorptive surface area. </li></ul>
  10. 10. 5. Large Intestines - also known as colon - Reabsorbs much of the water used in the digestive process and excretes certain salts, such as those of calcium and iron. Caecum – this is a small and functionally unimportant for human Appendix – finger-like process found at the tip of the caecum Feces – undigested food excreted into the colon and eliminated from the body. Rectum – Last portion of the large intestines that functions as a storage chamber for the feces until defecation Parts of the Digestive System
  11. 11. <ul><li>6. Anus </li></ul><ul><li>- opening for the elimination of feces. </li></ul>Parts of the Digestive System
  12. 12. <ul><li>Liver </li></ul><ul><ul><li>Largest gland in the body </li></ul></ul><ul><ul><li>Aids in chemical digestion by producing bile. </li></ul></ul><ul><ul><li>Occupies much of the space in the upper portion of the abdomen </li></ul></ul><ul><li>Gall bladder </li></ul><ul><ul><li>A small organ found on the surface of the liver which stores the bile. </li></ul></ul>Chemical Digestion
  13. 13. <ul><li>Pancreas </li></ul><ul><ul><li>Large glandular organ lying just below the stomach </li></ul></ul><ul><ul><li>Secretes different enzymes and pour these into the small intestines via the common bile duct </li></ul></ul>Chemical Digestion
  14. 14. <ul><li>Enzymes secreted by Pancreas </li></ul><ul><li>Lipase – enzyme that digest fats or splits fat into soluble glycerol and fatty acids </li></ul><ul><li>Pancreatic amylase – acts like salivary amylase, splitting starch into a double sugar maltose </li></ul><ul><li>Trypsin and chymotrypsin – breaks proteins toamino acids. </li></ul>Chemical Digestion
  15. 15. <ul><li>Intestinal Glands </li></ul><ul><ul><li>Completes the digestion of food. </li></ul></ul><ul><ul><li>1. Peptidase – peptides to amino acids </li></ul></ul><ul><ul><li>2. Sucrase – sucrose to glucose </li></ul></ul><ul><ul><li>3. Maltase – Maltose to glucose and fructose </li></ul></ul><ul><ul><li>4. Lactase – lactose to galactose and glucose </li></ul></ul>Chemical Digestion
  16. 16. Digestive Flow ORAL CAVITY ESOPHAGUS STOMACH SMALL INTESTINE LARGE INTESTINE RECTUM ANUS

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