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Blood Components and Functions: Plasma, Red and White Cells
Fichas del conjunto (6)
- 1Transport in Humans (blood)Blood (fluid tissue)
Is made up of
-Plasma
-PLatelets
-Red blood cell(e-ry-thro-cytes)
-White blood cell(leu-co-cytes) - 2PLASMA - proteins such as fi-bri-nogen, pro-thrombin and antibodies -food substances such as glucose, amino acids and fats -waste products such as urea, Uric acid and creatinine -hormonesPLATELETS
(thrombocytes)
- not true cells
- important for blood clotting
- lifespan of 6 days - 3RED BLOOD CELL (erythrocytes) - produced in the bone marrow -destroyed in the spleen -limited life span of 120 days --------Features-------- - filled with haemoglobin(red pigment) which is essential for binding oxygen - absence of nucleus which allows more haemoglobin to be packed into the cell - biconcave shape which inceases S.A. to vol. ratio for efficient uptake of oxygen - elastic which enables cells to squeeze through tiny blood capillariesWHITE BLOOD CELL
(leucocytes)
- larger and fewer than red blood cells
-produced in the bone marrow
- destroyed in the spleen
-limited lifespan of a few days
-colourless as they do not contain haemoglobin
- irregular in shape and contains a nucleus
-mobile (move, change shape,squeeze)
--------Types of white blood cell--------
Lymphocytes
- large round nucleus
- small amount of non-granular cytoplasm
- produce antibodies against microorganisms
Phagocytes
-lobed nucleus
-granular cytoplasm
-able to ingest foreign particles
- 4FUNCTIONS of BLOOD 1. Transport function : to carry various substances from one part of the body to another 2. Protective function - protect the body from disease-causing organisms - blood clotting or coagulation prevents entry of bacteria into the bloodstream and excessive blood loss1. Transport function of blood
- act as a medium for digested food substances, excretory products, hormones, heat, oxygen.
---Transport of oxygen to body cells---
1. Blood passes through lungs, oxygen diffuses from the air sacs in the lungs into the blood
2. Haemoglobin combines with oxygen to produce oxyhemoglobin
3. Blood transports oxygen to all the tissues of the body
4. At the tissue cells, oxyhemoglobin releases the oxygen
---Acclimatisation---
- people living at high altitudes have an increased number of red blood cell which leads to the increase in the amount of haemoglobin in the blood
- more oxygen can be transported - 5—
- 62. Protective function of blood - blood clotting - phagocytosis - production of antibodies
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- Fichas sobre Sin título, creado por vironiquetan el 13/02/2016.
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