Human digestion - CS Biology

• The stomach is the organ that secretes hydrochloric acid, which helps to break down proteins.
• Digestion is a process of breaking a large insoluble molecules into smaller soluble particles that can be absorbed into the bloodstream.
• Oesophagus (also known as the gullet). - oesophagus muscle do

  mechanical digestion to digest the food down to the stomach by a process known as peristalsis.
• Enzyme amylase which breaks down carbohydrates into maltose (chemical digestion)
• Enzyme protease to change protein into amino acid (chemical digestion).
• Hydrochloric acid which kills bacteria and provides the correct acidity for protease to perform.
• Pancreas - produces many enzymes, including amylase, protease and lipase.
• Small intestine have maltase enzyme, Lipas enzyme and are absorbtion of nutrients
• Maltase enzyme changes maltose into sugar
• Lipase enzyme changes fat into fatty acids and glycerol.
• Absorbtion of nutrients to the blood stream by villi(finger like shape in

  small intestine). Bile made by gall bladder at Liver is used to neutralize the acidity and digest fat more.
• Large intestine (colon)

  - Absorbtion fo water

  - Solid waste and fibre (faeces) are

  projected mechanically to rectum to

  be stored, later on it is excreted via

  anus.
• Bile made by gall bladder at Liver is

  used to neutralize the acidity and

  digest fat more.
• Large intestine (colon)

  • Absorbtion of water.
  • Solid waste and fibre (faeces) are

  projected mechanically to rectum to

  be stored, later on it is excreted via

  anus.
• Lipase enzyme changes fat into fatty

  acids and glycerol.
• Maltase enzyme changes maltose into

  sugar
• Absorbtion of nutrients to the blood

  stream by villi
• -Enzyme protease to change protein

  into amino acid (chemical digestion).
• stomach muscle performs mechanical

  digestion happens here.
• Two kind of digestion:

  1. Mechanical. Example: using

  teeth,muscle,pipe structure.

  2. Chemical. By using enzyme

  which is a biological catalyst

  that speed up the digestion

  reactions.