Here are 3 key things I learned:1. The digestive system breaks down food into smaller molecules through physical and chemical digestion to prepare nutrients for absorption. 2. The main organs of the digestive system include the mouth, esophagus, stomach, small intestine, pancreas, liver, gallbladder and large intestine.3. Peristalsis is the wave-like movement of muscles in the digestive tract that helps mix food with enzymes and propel it forward for digestion.One thing I'm still unsure about is the specific enzymes involved and their actions at each stage of digestion
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Similar to Here are 3 key things I learned:1. The digestive system breaks down food into smaller molecules through physical and chemical digestion to prepare nutrients for absorption. 2. The main organs of the digestive system include the mouth, esophagus, stomach, small intestine, pancreas, liver, gallbladder and large intestine.3. Peristalsis is the wave-like movement of muscles in the digestive tract that helps mix food with enzymes and propel it forward for digestion.One thing I'm still unsure about is the specific enzymes involved and their actions at each stage of digestion
Similar to Here are 3 key things I learned:1. The digestive system breaks down food into smaller molecules through physical and chemical digestion to prepare nutrients for absorption. 2. The main organs of the digestive system include the mouth, esophagus, stomach, small intestine, pancreas, liver, gallbladder and large intestine.3. Peristalsis is the wave-like movement of muscles in the digestive tract that helps mix food with enzymes and propel it forward for digestion.One thing I'm still unsure about is the specific enzymes involved and their actions at each stage of digestion (20)
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Here are 3 key things I learned:1. The digestive system breaks down food into smaller molecules through physical and chemical digestion to prepare nutrients for absorption. 2. The main organs of the digestive system include the mouth, esophagus, stomach, small intestine, pancreas, liver, gallbladder and large intestine.3. Peristalsis is the wave-like movement of muscles in the digestive tract that helps mix food with enzymes and propel it forward for digestion.One thing I'm still unsure about is the specific enzymes involved and their actions at each stage of digestion
- 2. 1. To break down large food molecules into simpler and soluble molecules. 2. To prepare nutrients for absorption by cells - The small, soluble molecules diffuse from the alimentary canal into the bloodstream to be transported to the cells of the body.
- 3. 5) Egestion – Removal of undigested food substances 1) Ingestion – Process of taking in food 2) Digestion – Complex food molecules are broken down into smaller, soluble molecules that can be absorbed into the body cells 3) Absorption – Digested food are absorbed into the body cells 4) Assimilation – Absorbed food substances are use to provide energy and use to form new cells
- 4. Objectives You will learn to: • Define and explain the importance of physical and chemical digestion. • Identify the main part of the human digestive system (mouth, salivary glands, oesophagus, stomach, small intestine, liver, gall bladder, pancreas, large intestine, rectum and anus). • Describe the functions of the mouth, salivary glands, oesophagus and stomach in relation to ingestion, movement of food along the gut, physical and chemical digestion. • Describe peristalsis in terms of rhythmic wave-like contractions of the circular and longitudinal muscles to mix and propel food along the alimentary canal.
- 5. Physical Digestion Chemical Digestion Breaking down of food into smaller pieces Increases surface area of food but does not change the chemical structure of food Breaking down of large complex food molecules into smaller, simpler food molecules So that it can be absorbed by the body
- 6. Mouth Oesophagus Stomach Small intestine Large intestine Liver Gall bladder Pancreas Glands associated with the alimentary canal Organs of the alimentary canal Rectum Anus Salivary gland
- 7. Mouth Ingestion of food Chewing of food by the teeth breaks down food into smaller pieces Salivary amylase digest Starch to Maltose Salivary glands - produces Salivary amylase
- 8. Oesophagus Food rolled into boli passes down into the Oesophagus Peristalsis propel food along the gut and mix food with the digestive juices Peristalsis - Wave like contractions of the muscles in the gut walls Note: Peristalsis occurs from the Oesophagus to the rectum!
- 9. Longitudinal muscle Circular muscle Part of the gut wall
- 10. Circular muscle contract, Longitudinal muscle relax Wall of the gut constricts – It becomes narrower and longer Push the bolus forward Circular muscle relax, Longitudinal muscle contact Wall of the gut dilates – It becomes wider and shorter Lumen is widen for food to enter Mass of food Antagonistic action of the muscles
- 11. How is this analogy different from the actual peristalsis that is occurring along the alimentary canal?
- 12. Animal Nutrition Oral Cavity Carbohydrate Digestion Physical Digestion Salivary Amylase Starch Maltose Teeth Tongue Food Smaller Pieces Mix Food Bolus Oesophagus Peristalsis Antagonistic Muscles Circular Longitudinal Stomach Protein Digestion Gastric Juice Enzymes HCl Acidic Medium Pepsin Rennin Protein Polypeptides Soluble Milk Proteins Insoluble Caesin Small Intestine Carbohydrate Digestion Protein Digestion Fat Digestion Pancreatic Amylase Intestinal Maltase Pancreatic Trypsin Intestinal Peptidase Bile Pancreatic Lipase Intestinal Lipase Fats Smaller Globules Polypeptides Amino acids Starch Maltose Fatty Acids Glycerol Liver Large Intestine Colon Rectum Faeces Anus Detoxification Deamination Glycogen storage involves involved in by hydrolyses into involves break down into into helps involved in involves that are involved in by contains provides for consist of hydrolyses into into coagulates hydrolyses hydrolyse hydrolyse into into into involved in Consists of involves involves involves emulsifies into is involved in is for storing is egested via Eventually lead to has functions like Blood glucose level Breakdown of fatty acids to regulate Energy Amino Acids to provide Breakdown of haemoglobin Recycle iron of Heat production Body temperature to regulate hydrolyses Maltose Monosaccharides Transported by into Blood capillaries Transported by Lacteals to Absorption of H2O and Mineral salts
- 13. Write 3 key things that you learn today? What am I still unsure about?
Editor's Notes
- The alimentary canal is about 8 to 10 m long. Why do we need such a long alimentary canal?
- So what type of digestion takes place in the mouth
- Peristalsis will propel or push food down the gut. Does digestion of food by salivary amylase still occur as food is pass through the oesophagus? In fact peristalsis does not only in Oesophagus but along the alimentary canal . E.g through the stomach, along the small intestine
- So what causes the wave like contraction of the gut wall has got to do with 2 layer of muscles of the gut wall
- Analogy and question – how is this analogy different from the actual peristalsis that is happening along the alimentary canal
- Review the learning outcomes