What is the double circulatory system?
- Mammals have one circuit that links the heart and lungs
- The other circuit links the heart with the rest of the body
- This system increases the flow of blood to the tissues
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What does blood carry to the muscles?
- glucose moleclues
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What does blood carry away from the muslces?
- Waste products
- Carbon dioxide
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What do red blood cells do?
- Transprot oxygen
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What do white blood cells do?
- Protect agianst disease by fighting infections
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What do platelets do?
- Clot the blood at points of injury
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What does plasma do?
- Plasma transports dissolved substances around the body- this includes
- Nuitrience e.g. water, glucose, amino acids, minerals and vitamins
- Waste substances e.g. Carbon dioxide and urea
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How have red blood cells adapted?
- Small size- allowing blood to pass through narrow capillaries
- Flatterend disk shape- provides large surface area allowing rapid difusion of oxygen
- Contains haemoglobin- haemoglobin absorbs oxygen in the lungs and releases oxygen in the rest of the body
- Does not contain a nuclues- increses amount of space for haemoglobin
- Having a biconcave shape- increases surface area for oxyen exchange
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What are the main features of the heart?
- Left and Right atria and vebtricles
- vena cava
- pulmonary vein
- pulmonary artery
- coronary arteries and valves
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Function of valves in the heart and veins
- Valves prevent backwards flow in the heart and veins
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Use of tissue fluid
- Tissue fluid is formed in capilary beds and that it assist the exchange of chemicals by deffusion between capilaries and tissues, to incluse oxygen carbon dioxide, glucose and urea.
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