6.1 Digestion Flashcards
1
Q
Amylase
A
- Salivary amylase
- Source: salivary amylase
- Substrate: starch
- Product: maltose
- pH7
2
Q
Protease
A
- Pepsin
- Source: Gastric juice in stomach
- Substrate: Protein
- Product: Short polypeptide
- pH 2
3
Q
Lipase
A
- Pancreatic lipase
- Source: pancreas
- Substrate: Lipids (triglycerides)
- Product: Glycerol
- pH8
4
Q
Stomach
A
- Acts as a temporary storage tank
- Gastric glands for chemical digestion
- Acids - low pH → denatures protein
- Churning - promotes digestion by mixing food
- Turns food into chyme (creamy paste)
5
Q
Small intestine
A
- Nutrients absorbed into bloodstream
- Pancreas and gall gladder secrete substances to aid in digestion
- Villi - to increase surface area and optimise the rate of reaction
6
Q
Large intestine
A
- Absorbs water and dissolved minerals from the indigestible food residue → turns fluid into faeces
- Faeces stored in rectum, eliminated through anus
7
Q
Absorption
A
Movement of fluid/dissolved substances across membranes
8
Q
Assimilation
A
Conversion of fluids/solid parts to make part of an organism
9
Q
Role of enzymes in digestion
A
- catalysts that speed up the rate of chemical reaction
- Allow digestion to occur at body temperature
