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Digestive System

Digestive System. 30.2 & 30.3. Digestive System. Functions: Convert food into small molecules that can be used by cells. Amino acids Fatty acids Monosaccharides Nucleotides Vitamins Electrolyes Water. 4 Phases of Digestion. Ingestion Digestion Mechanical Chemical Absorption

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Digestive System

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  1. Digestive System 30.2 & 30.3

  2. Digestive System • Functions: • Convert food into small molecules that can be used by cells. • Amino acids • Fatty acids • Monosaccharides • Nucleotides • Vitamins • Electrolyes • Water

  3. 4 Phases of Digestion • Ingestion • Digestion • Mechanical • Chemical • Absorption • Elimination

  4. Mouth • Ingestion • Mechanical Digestion • Chemical Digestion • Accessory Organs • Teeth, Tongue, Salivary glands

  5. Esophagus Epiglottis Peristalsis

  6. Upper Digestive Tract Summary: Mouth Esophagus

  7. Stomach Cardiac Sphincter • Mechanical Digestion • chyme • Chemical Digestion • Pepsin • HCl • Mucus

  8. Small Intestine • Chemical Digestion • Absorption • Assisted by Accessory Organs Villi

  9. Accessory Organs of the S.I. • Liver • Bile separates fat into smaller droplets • Mechanically breaks down fats so enzymes can digest fat into fatty acids faster • Gall bladder • Stores excess bile

  10. Accessory Organs of S.I. • Pancreas • Secretes hormones to regulate blood sugar • Secretes enzymes into small intestine that help digest proteins, sugars, fats and nucleic acids • Secretes bicarbonate ions into small intestine to raise pH of acidic chyme

  11. Enzymes and Chemical Digestion

  12. Large Intestine • Absorption • Elimination

  13. Lower Digestive Tract • Summary:

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