Chapter 3

Question 1

What are 3 types of organisation in an living organism?

Answer 1

• tissue
• organ
• organ system

Question 2

What is a tissue?

Answer 2

a group of cells with a similar structure and function (e.g. muscle tissue)

Question 3

What is an organ?

Answer 3

a group of tissues performing a specific function (e.g. heart, leaf)

Question 4

What is an organ system?

Answer 4

a group of organs that perform a specific function (e.g. digestive system)

Question 5

What are 3 digestive enzymes, and what do they do?

Answer 5

• amylase - breaks starch into sugars
• protease - breaks proteins into amino acids
• lipase - breaks lipids inti fatty acids and glycerol

Question 6

What are the sites of production and sits of action for the enzyme amylase?

Answer 6

• salivary glands, pancreas, small intestine

- mouth, small intestine

Question 7

What are the sites of production and sits of action for the enzyme protease?

Answer 7

• stomach, pancreas, small intestine

- stomach, small intestine

Question 8

What are the sites of production and sits of action for the enzyme lipase?

Answer 8

• pancreas, small intestine

- small intestine

Question 9

What does bile do?

Answer 9

it emulsifies fat, is an alkaline so it neutralises acid from the stomach. Produced in liver, stored in gall bladder and is released into the small intestine

Question 10

Why does bile emulsify fat?

Answer 10

to create droplets to give a greater surface area