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Identifying cells
| cell | How to identify it. |
|---|---|
| red blood cells or erythrocytes | Are biconcave discs. They transport oxygen and co2. Their shape means they have a large surface area to speed up gas exchange. Their cytoplasm is packed with haemoglobin. mature red blood cells don't have a nucleus which gives more room for haemoglobin. |
| More about edrythrocytes | They are very small and flexible, so they can be flattened against capillary walls. this reduces the distance that gases have to diffuse across which again speeds up gas exchange. |
| Leucocytes | They are white blood cells |
| Neutrophils | Have small granules in the cytoplasm. these cells engulf microorganisms by phagocytosis. |
| lymphocytes | Have a large, darkly-stained nucleous surrounded by a thin layer of clear cytoplasm. There are two kinds of lymphocytes, B & T, wich look the same but have different function. Both are cells of the immune system. |
| monocytes | They are the largest kind of leucocytes. they have a large, bean-shaped nucleus and cear cytoplasm.They spend 2-3 days in the circulatory system, then move into the tissues.here they become macrophages, engulfing microorganisms and other foreign materials |
| platelets | these are fragments of giant cells called megakatyocytes, they are involved in blood clotting |
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Crazyclutz
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