3.2 Transport system

Question 1

Why do multicellular organisms require transport systems?

Answer 1

• Large size (small surface area to volume ratio, higher metabolic rates.
• Demand for oxygen is higher, so a specialised system is needed to ensure a strong supply to all respiring tissues.

Question 2

Different types of circulatory systems?

Answer 2

• Open= blood can diffuse out of vessels e.g. insects.
• Closed= blood confined to vessels e.g. fish, mammals,

Question 3

What is tissue fluid?

Answer 3

A watery substance containing glucose, amino acids, oxygen and other nutrients. It supplies these to the cells, while also removing any waste material.