BRAINCAKEThe Need for a Transport System
Large multicellular organisms need a specialised transport system because simple diffusion is not fast enough to meet their metabolic needs.
Oxygen is needed for respiration and carbon dioxide is a waste product and needs to be removed.
The larger the organism, the smaller the surface area to volume ratio.
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Key terms in this lesson
- diffusion
- The net passive movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
- surface area to volume ratio
- The ratio of an organism's or structure's external surface area to its total volume, which decreases as size increases.
More in Mass Transport in Animals
- Lugworm
- Llama
- Fetal Haemoglobin
- Myoglobin
- Features of a Transport System
- Circulatory Systems
- Structure of the Human Heart
- Coronary Arteries
All 27 lessons in Mass Transport in Animals · All AQA AS-level Biology topics