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Parts by Mind Map: Parts

1. Mouth

1.1. Food enters in the mouth or oral cavity

1.2. Mechanical breakdown of food

1.3. Secretion of salivary glands (salivary amylase)

1.4. Tasting

2. Esophagus

2.1. A straight muscular tube that is about 10 inches (25 cm) long which connects the mouth with the stomach

2.2. Its walls contain smooth muscles that contracts in wavy motion (Peristalsis)

2.3. Peristalsis propels food and liquid slowly down the esophagus into the stomach.

2.4. Cardiac Sphincter (ring-like valve) relaxes to allow food in the stomach.

3. Stomach

3.1. J-shaped muscular sac

3.2. Has inner folds (rug) that increases the surface area of the stomach.

3.3. Churns and grinds together the bolus into smaller pieces.

3.4. Food is mixed with gastric juices (hydrochloric acid and enzymes) secreted by the stomach walls.

3.5. HCL helps break down food and kills bacteria that came along with the food.

4. Small Intestine

4.1. Takes about 4-8 hours to complete its journey.

4.2. Mucosa (inner wall) - secretes several enzymes that acts on the food.

4.3. Where the pancreatic enzymes are emptied into.

4.4. Digested nutrients are absorbed through intestinal walls.

4.5. Absorbed materials cross the mucosa into the blood then other parts of the body for storage or further chemical change.

5. Large Intestine

5.1. a.k.a colon

5.2. larger diameter, but shorter (5ft)

5.3. Water is absorbed from the undigested food making the waste harder until it becomes solid.

5.4. Waste stays for 10-12 hours.

6. Anus

6.1. The anus is the end of the gastrointestinal (GI) tract.

6.2. When the rectum is full, your body feels the urge to have a bowel movement.

6.3. The internal anal sphincter relaxes and pushes the stool from the rectum into the anal canal.

7. Liver

7.1. Largest gland of the body

7.2. Stores vitamins A,D,E,K

7.3. Stores sugar and glycogen

7.4. Produces bile (watery, greenish substance)

7.5. Secretes bile to the gall bladder via the hepatic duct and cystic duct.

8. Pancreas

8.1. Produces a juice that contains enzymes (amylase and insulin) to break down carbohydrates, fats and protein.

8.2. Secretes the juice into the duodenum through the pancreatic duct.

9. Gall bladder

9.1. Stores bile in between meals

9.2. Secretes bile to the duodenum through the bile duct during mealtime.