What happens when you swallow? L/O ;- To be able to label the digestive system and explain the function of each part True or False Protein is important for growth Iodine is used to test for protein Carbohydrates are used for energy Meat is a good source of protein You should not eat any fat at all in your diet Benedict solution goes orange when there is sugar present Fibre is needed for insulation What is digestion? What organs do you think are involved in digestion? Lots of organs play a role in digestion, including: Mouth Stomach Intestines Anus + liver and pancreas (although food does not pass through these) (*appendix helps digest cellulose in some animals, but has no real use in humans) Mouth Teeth break food up and saliva starts to digest food Stomach Hydrochloric acid kills bacteria and stomach juices digest proteins Small Intestine Food is digested and absorbed into the blood Large Intestine Water is absorbed and faeces compacted Liver Produces Bile to help digest fats Pancreas Produces enzymes Cows Why is it that cows have 4 stomachs? Cows, goats, sheep and several other animals belong to a class of animals called ruminants. Ruminants have four stomachs and digesting their food in these stomachs, rather than in their intestines. Ruminants eat food, regurgitate it as cud and eat it again. The stomachs are filled with bacteria that aid in digestion This is all because its difficult to break the grass down and absorb the nutrients (cellulose cell walls). It takes a long time to process this food, which is why they have four stomachs! Rabbits Why do rabbits eat their poo?! This is a similar situation for the rabbits as it was with the cows - its difficult to get all the nutrients from the grass, as the cell wall (cellulose) is difficult to break down For this reasons rabbits re-ingest their excrement, helping get all the nutrients within In other words, the eat their poo to get a second shot at absorbing all the nutrients they passed out first time