BRAINCAKETypes of Circulatory System
Blood must be brought close to the cells since nutrient and metabolic waste exchange takes place by passive diffusion.
Diffusion is only efficient over short distances.
A circulatory system uses bulk flow to reduce the effective distance between the transport medium and the various parts of an organism.
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Key terms in this lesson
- diffusion
- The net movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
- open circulatory system
- A circulatory system in which the transport medium is pumped into an open body cavity and bathes the tissues directly, rather than remaining inside vessels.
More in Transport in Animals
- Specialised Transport Systems
- Features of a Transport System
- Open Circulatory Systems
- Closed Circulatory Systems
- Single Closed Circulatory Systems
- Double Closed Circulatory Systems
- Blood Vessels
- Arteries
All 22 lessons in Transport in Animals · All OCR AS-level Biology topics