A-Level Biology - Digestion, A Level AQA Biology D
A-Level Biology - Digestion, A Level AQA Biology D
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A-Level Biology - Digestion, A Level AQA Biology Digestion Questions And Answers
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A-Level Biology - Digestion, A Level AQA Biology D
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A-Level Biology - Digestion, A Level AQA Biology D
A-Level Biology - Digestion, A Level AQA Biology Digestion Questions And Answers
What is Ingestion?
The process of taking food into the digestive system.
What is digestion?
The breakdown of food in order to utilise nutrients.
How can we break down food?
Mechanically or Chemically
What is...
A-Level Biology - Digestion, A Level AQA Biology D
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A-Level Biology - Digestion, A Level AQA Biology
Digestion Questions And Answers
What is Ingestion?
The process of taking food into the digestive system.
What is digestion?
The breakdown of food in order to utilise nutrients.
How can we break down food?
Mechanically or Chemically
What is Absorption?
When the nutrients from food pass from the gut into the blood stream.
What is Egestion?
The removal of digested food.
What is Peristalsis?
The involuntary movement of muscle contractions to move food forward.
What helps to make sure you do not choke on food?
Epiglottis
What is the Epiglottis?
A flap of cartilage which closes the trachea when swallowing food.
What is the oesophagus?
A muscular tube in which food moves down by the process of peristalsis.
What acts as a lubricant in the oesophagus?
Mucus secreted from the cells in the oesophagus.
What are the functions of the stomach?
To store food
Disenfect Food
Chemical Digestion
How does the stomach store food?
The stomach can stretch to fit two litres of food.
How does the stomach do chemical digestion?
The Peptidase enzyme breaks down proteins into amino acids.
What are the three layers of the stomach from the outside to the inside?
, Longitudinal muscle layer, Circular Muscle Layer, Oblique Muscle Layer
What are the two sphincters of the stomach?
Cardiac and Pyloric
What does the Pyloric sphincter of the stomach do?
It secretes gastric juice.
What are the two accessory organs?
Pancreas and Gall Bladder
What is the function of the gall bladder?
It is a pouch located near the liver which stores bile.
What is the bile duct?
A long tube which carries bile. It also connects the gall bladder to the duodenum.
What is bile?
An alkaline fluid.
What is the purpose of bile?
To emulsify fat to increase surface area and neutralise the stomach pH
Why does bile have to neutralise the stomach pH?
So the protease enzyme can work at the right pH
What are the digestive enzymes?
Proteases, Lipase and Amylase
What does proteases break down?
Proteins into amino acids
What does Lipase break down?
Lipids into fatty acids and glycerol.
What does amylase break down?
Starch into Maltose (Glucose)
What is a buffer?
A solution with a highly stable pH that will cause the pH of a buffers solution to
remain the same if a acid is added.
What are the two sections of the small intestine?
The duodenum and the ileum
What is the function of the small intestine?
Chemical digestion and absorption through the lining.
What occurs in the duodenum?
Digestion of foods
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