Topic 1A: Water and Transport

Question 1

What are the two functions of water in the body?

Answer 1

1. It’s a solvent allowing substances to dissolve in it

2. Transports substances

Question 2

What name is used to describe the structure of water?

Answer 2

Dipole structure

Question 3

Explain how the structure of water enable it to transport substances (3)

Answer 3

1. Water has a dipolar structure
2. Therefore it has a positive and negative side
3. Makes it a good solvent fr ionic substances allowing them to be transported
4. Water is is also cohesive helping it to flow and transport substances.

Question 4

Explain how materials are transported in single celled organisms (2)

Answer 4

1. Materials diffuse directly into cell accros cell membrane

2. This is effective because there is a short diffusion pathway (Diffusion rate is quick)

Question 5

Would diffusion be a good way to transport materials in complex multicelluar organism? (2)

Answer 5

1. No, because this would be too slow

2. Because substances will have to travel over large distances

Question 6

How do multicellular organisms transport substances around the body?

Answer 6

Mass transport system

Question 7

What is a Mass transport system?

Answer 7

A system used in multicelluar organisnms to carry raw material from specialised exchange organs to the body cells and to remove metabolic waste