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4 Cards in this Set
- Front
- Back
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Veins function |
To the heart after capillaries do gas exchange Thin walls because blood is at lower pressure here after being deoxygenated.
They have a bigger space inside them to help blood flow and have valves to keep the blood flowing in the right direction. |
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Capillaries function |
Walls are one cell thick to allow gas exchange and decrease distance substances must travel. Permeable walls
They are tiny and carry blood extremely close to every single cell to exchange substances with them. Arteries branch into capillaries all over the body for gas exchange then capillaries join up to veins. |
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Arteries function |
Take oxygenated blood away from the heart and branch into capillaries.
Strong elastic walls for high pressure of blood pumping. They contain muscles and thick layers of elastic fibers. Walls are thicker than the space inside them. |
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Substances in the blood |
Platelets help blood clot, they stop blood leaving and microorganisms entering, no nucleus.
Plasma carries everything in blood: It suspends red and white blood cells and platelets. platelets. In the plasma are dissolved substances such as proteins, electrolytes, nutrients, glucose, amino acids, gases and waste products such as carbon dioxide |
