Module 3: Transport in Animals

Question 1

Why do organisms require a mass transport system?

Answer 1

Organisms require oxygen and glucose to produce energy for aerobic respiration.

Small organisms such as bacteria, can obtain these by diffusion due to short diffusion pathway/distance

However, large organisms have a large diffusion distances meaning that diffusion would be too slow to reach the cells in the centre of the body. therefore they require mass transport systems.