July 8, 2021
In I/GCSE Biology, it is important to remember the topic of digestive system. Let's get started!!!! 😁
The Digestive System
In this post, we will briefly introduce different organs in the digestive system!
Mouth:
- How food enters the body
- Chewing breaks up food and mixes it with enzymes to start digestion
Oesophagus:
- Carries food from mouth to stomach by peristalsis
- Peristalsis is the contraction and relaxation of muscles which pushes the food down
Stomach:
- Acid and enzymes added
- Stomach contents mixed by churning of muscular wall
Liver:
- Produces bile, which helps in the digestion of fats in small intestine
- Converts food molecules absorbed from small intestine into other molecules
In I/GCSE Biology, make sure you understand the function of gall bladder!
Gall bladder:
- Where bile from the liver is stored until needed in the small intestine
Pancreas:
- Produces enzymes that are released into the small intestine
Small intestine:
- Digestion of food molecules completed
- Food molecules are absorbed into the blood by villi containing capillaries
- Water absorbed from digested food
Large intestine:
- Some water is absorbed
- Undigested food forms faeces that pass out of the body through the anus
And we're done with this topic! Well Done!
Drafted by Alyssa (Biology)
References:
- "Parts of the Digestive System", https://s3-us-west-2.amazonaws.com/courses-images/wp-content/uploads/sites/1223/2017/02/07185052/Figure_34_01_08ab-1024x518.jpg
- "What is the oesophagus?", https://www.macmillan.org.uk/dfsmedia/1a6f23537f7f4519bb0cf14c45b2a629/562-50033/macd093b-position-of-oesophagus-in-the-digestive-system-labelled-20190730
- "Digestive System - Process in stomach", https://i.ytimg.com/vi/cFT5N8G0WRE/maxresdefault.jpg
- "Small intestine". Photo from the internet.
- "Gastrointestinal tract 5", https://cdn.ps.emap.com/wp-content/uploads/sites/3/2019/09/Fig-1-Anatomy-of-the-large-intestine-1024x891.jpg