The Circulatory System | Nota

Notas por Shane Buckley, criado more than 1 year ago

Junior cert level notes on the Circulatory System.

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	Criado por Shane Buckley quase 10 anos atrás

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The Circulatory System
Blood Red blood cells

Haemoglobin - red, carries oxygen
Disc shaped, thinner at the centre
No Nucleus

White blood cells

Contain a nucleus
No definitive shape
Protect against disease

Tiny fragments of cells
No nucleus
Cause blood to clot

Functions of blood

Transport
Defence against disease

Blood Vessels Artery

Carry blood from the heart
Narrow lumen
Thick walls
High Pressure (Fast movement of blood)
No valves

Vein

Carry blood back to the heart
Wider lumen
Thinner walls
Low Pressure (Slow movement of blood)
Valves to stop back-flow of blood

Tiny blood vessels
Walls one cell thick
Substances pass into blood through capillaries