Chemical + physical digestion

Question 1

What is digestion

Answer 1

The process of breaking down large food molecules into smaller molecules that can then be absorbed into the bloodstream and transported to cells.

Question 2

What is physical digestion?

Answer 2

Breakdown of large chunks of food into smaller chunks of food to increase the surface area to volume ratio for digestive enzymes.

Question 3

What are two examples of physical digestion?

Answer 3

chewing, muscle contractions

Question 4

what is chemical digestion?

Answer 4

when Enzymes break down large complex structures into their simplest form where they are absorbed into the bloodstream and transported to cells.

Question 5

what are the three main digestive enzymes?

Answer 5

protease
amylase
lipase

Question 6

What does protease do? (whats their optimal ph?)

Answer 6

Breaks down proteins into amino acids
- Proteins are digested in the stomach with help from stomach acid
- optimal ph is 1.6

Question 7

what does amylase do (whats their optimal ph)?

Answer 7

Breaks down carbohydrates (starch) into sugars
- Amylase is located in the saliva of the mouth
- Optimal ph: 7.0 (neutral)

Question 8

what does lipase do (whats their optimal ph?)

Answer 8

• Breaks down fats into fatty acids and glycerol
  - Fats are digested in the small intestine with the help from bile (made in the liver)
  - Optimal ph: 8.0

Question 9

What are the four stages of the digestive process?

Answer 9

1. Ingestion: The taking in of nutrients (food enters the gastrointestinal tract)
   2. Digestion: Food is physically and chemically broken down
   3. Absorption: Nutrients are absorbed in the bloodstream.

Egestion: Undigested food is eliminated from the body