I/GCSE Biology - The Digestive System (1)

In I/GCSE Biology, it is important to remember the topic of digestive system. Let's get started!!!! 😁

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!

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Drafted by Alyssa (Biology)

References:

1. "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
2. "What is the oesophagus?", https://www.macmillan.org.uk/dfsmedia/1a6f23537f7f4519bb0cf14c45b2a629/562-50033/macd093b-position-of-oesophagus-in-the-digestive-system-labelled-20190730
3. "Digestive System - Process in stomach", https://i.ytimg.com/vi/cFT5N8G0WRE/maxresdefault.jpg
4. "Small intestine". Photo from the internet.
5. "Gastrointestinal tract 5", https://cdn.ps.emap.com/wp-content/uploads/sites/3/2019/09/Fig-1-Anatomy-of-the-large-intestine-1024x891.jpg