Biology digestive system
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What is the digestive system?
It’s a group of organs that work together to break down food
During digestion, … molecules are broken down into …. Molecules and pass into the ….
Large, small and bloodstream
What does the mouth do in the digestive process?
Chews food and is mixed with saliva, teeth help break down food into smaller chunks
What does the gullet do in the digestive system?
Food is passed down into the stomach
What does the stomach do in the digestive system?
Food is mixed with digestive juices and acids
What does the small intestines do in the process of digestion?
Digestive juices and pancreas are added and digestion is complete, small molecules can pass through the intestine wall into the bloodstream
What does the large intestines do in the process of digestion?
Only food that isn’t digested reaches here, water passes back into the body leaving a solid waste of undigested food
What is the solid waste of undigested food called?
Faeces
What does the rectum do in the process of digestion?
Faces are stored here until they are ready to leave the body
What does he anus do in the process of digestion?
It’s a muscular ring which the faeces passes out of the body
What happens if you leave your faeces for too long in the. Body?
More water would leave the faeces which makes you have constipation
What is diarrhoea?
When enough water hasn’t left the faeces
What do the muscles do to make sure the fibre goes through the gut?
Pushes out the food, forcing it along the gut
What foods prevent constipation?
Eating fibre-rich foods like fruits, vegetables and wholesome bread
How does food go into the blood?
Small molecules of nutrient produce during digestion which passes into the bloodstream through the wall of the small intestines, the are then transported around the body
What are the four adaptations of the small intestines?
The small intestine walls are thin so molecules can pass through easily It’s covered with tiny structures called villi, these stick out of the wall and give it a large surface area for diffusion Contain blood capillaries to carry away to absorbed food molecules Rich blood supply to take nutrients where needed and maintain diffusion gradient