T4 Revision Flashcards
How does the mouth aid digestion?
It has saliva (enzymes) which is chemical digestion and also uses mecanical digestion (teeth)
What does saliva contain? [2 marks]
Enzymes and Buffers
Buffers counteract acidity in your mouth which prevents tooth decay
What is a bolus?
It is a ball of food and saliva which is formed as a result of chewing.
What is peristalsis?
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract.
Where does peristalsis occur [3 marks]
- Oesophagus
- Small intestine
- Large intestine
What type of muscle does peristalsis use?
Smooth muscle
What chemicals are found in the stomach? [2 marks]
- Gastric juices
- Hydrochloric acid
After a few hours, what is the resulting substace from the stomach called?
Chyme
What are those barriers near the stomach called? Where are they found?
- Sphincters
They are found seperating the oesophagus and stomach and then the stomach from the small intestine
What are the three parts of the small intestine called?
-Duodenus
-Jejunum
-Ileum
(DJ Ivan)
What are the small hair like projections called in the small intestine?
Villi
What does the liver do?
Produces bile
What does the Gallbladder do?
Stores bile
What does the pancreas do?
Produces pancreatic juices
What does pepsin do?
Breaks down proteins
