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Digestive System.

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Presentation on theme: "Digestive System."— Presentation transcript:

1 Digestive System

2 Digestive System 3 main functions 2 main divisions Digestion
Absorption Elimination 2 main divisions Alimentary canal Tube from mouth to anus Accessory organs Aid in digestion

3 Digestive System Elimination Digestion
Process of breaking down food into molecules the body can absorb. Absorption Process of molecules passing from the alimentary canal to blood stream. Elimination Process of the body getting rid of unabsorbed solids and liquids Feces Urine

4 Alimentary Canal Tube from mouth to anus Mouth / oral cavity Ingestion
Putting food in your mouth Mastication Chewing Bolus Mass of chewed food

5 Alimentary Canal Throat / Pharynx Connects mouth to esophagus
3 sections Nasopharynx Oropharynx laryngopharynx Deglutition swallowing

6 Alimentary Canal Esophagus Connects throat to the stomach Peristalsis
Epiglottis Covers the trachea during swallowing Peristalsis Contraction of smooth muscle to move food through digestive tract.

7 Alimentary Canal Stomach Sac like organ Digestion continues
Bolus mixes with gastric juices… Hydrochloric acid Pepsin Chyme Soupy mass of food and gastric juices Digestion continues Absorption begins

8 Alimentary Canal Small intestine
Connects stomach to the large intestine 3 main parts Duodenum Jejunum Ileum Most nutrient absorption occurs here. Fat is broken down by bile.

9 Alimentary Canal Large intestine 3 main sections
Cecum Colon Rectum Anus Opening to the rectum Elimination occurs here

10 Accessory Organs All the organs that aid in the digestive process.
Teeth Salivary glands Saliva Tongue Muscles Liver Pancreas

11 Accessory Organs Teeth Incisors – cut Cuspids – tear Premolars – chew
Molars – grind, chew Chewing mastication Mechanical break down of food.

12 Accessory Organs Saliva glands Saliva 3 pair Produce saliva
Parotid Sublingual Submandibular Produce saliva Saliva Lubricates food Enzyme Salivary amylase Chemically breaks down food

13 Accessory Organs Tongue (glossus muscle) Muscles
Moves and holds food between teeth. Moves food (bolus) towards throat. Muscles Mastication = chewing Deglutition = swallowing Paristalsis = contraction of smooth muscle

14 Accessory Organs Liver Produces bile Breaks down fat for absorption
Stored in the gallbladder Yellowish-green alkaline fluid Found in small intestine

15 Accessory Organs Pancreas
Produces and secretes pancreatic juices containing digestive enzymes Empty into small intestine Completes the breakdown of carbohydrates

16 Conclusion Understanding the digestive is very important.
Teeth are organs of the digestive system, and tooth decay (caries) is a disease of the digestive system. Any questions??

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