Transporting Materials
- Created by: Lizzi
- Created on: 10-05-13 19:10
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- Transporting Materials
- The Heart/ circulation
- Double circulation system consists of blood vessels, blood, and the heart
- Heart pumps blood around the body
- Valves prevent backflow
- Arteries carry blood AWAY from the heart
- Thick wall, muscle, small lumen
- Veins carry blood TOWARDS the heart
- Quite thin walls, large lumen
- Stents are used to keep arteries open
- Blood
- Blood is a tissue: fluid is plasma, contains red and white blood cells, and platelets
- Blood plasma transports: CO2 (to lungs), soluble products of digestion, and urea to the kidneys
- Red blood cells: are biconcave, contain the red pigment haemoglobin,carry oxygen
- Haemoglobin + Oxygen = Oxyhaemoglobin
- White blood cells: have a nucleus, help fight off disease
- Platelets: are small cell fragments, have no nucleus, help blood clot
- Plants
- Flowering plants have the xylem, phloem
- Xylem transports water and mineral ions from the roots to the stem leaves
- Phloem transports food (eg: sugars)- from the leaves- around the plant
- The Heart/ circulation
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