Digestive Process

• Mouth

  • Physical - Chewing
  • Chemical - Salivary Amylase (starch)
• Stomach

  • Physical - Peristalsis
  • Chemical - Gastric Juice
• Gastric Juice changes Pepsinogen to Pepsin (protein > polypeptides)
• Pancreatic Amylase

  • Starch > Maltose
• Maltase

  • Maltose > Glucose
• Trypsin

  • Protein > Polypeptide
• Peptidase

  • Polypeptide > Amino Acid
• Villi: finger-like projections in the small intestine
• More Surface Area = More Absorption of Nutrients
• Thin Membrane = Easier Pass Through of Nutrients
• Concentration Gradient

  • Small Intestine - high concentration
  • Capillaris - low concentration
• Capillaries

  • Blood - sugar, amino acid
  • Lymphatic/Lacteals - fats
• Assimilation: absorbed food substances are converted into new protoplasm/used for energy

  
• Glucose (Assimilation)

  • for cellular respiration
  • excess - stored as glycogen
• Amino Acid (Assimilation)

  • synthesis of plasma/protoplasm
  • excess - urea
• Lipid (Assimilation)

  • for plasma membrane synthesis
  • excess - stored in adipose tissue