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Published byFlora Adams Modified over 8 years ago
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BLOOD
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FUNCTIONS OF BLOOD Blood has six major functions: 1.Transports materials from one place to another. 2.Provides a watery environment for individual cells. 3.Helps to maintain a constant internal temperature. 4.Plays a major role in combating disease and infection. 5.Helps to regulate the body’s pH level. 6.Prevents the loss of body fluids through the clotting process.
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BLOOD BAG ACTIVITY Cells = 45% Red Blood Cells represented by the marshmallows White Blood Cells represented by the cotton balls Platelets represented by the lentils Plasma = 55% represented by the air in the baggy What is the baggy representing?
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What’s in Blood? Red Blood Cells aka Erythrocytes 40-45% of the blood Concave centre- as they lack a true nucleus Iron in RBCs makes the cell red. Haemoglobin carries oxygen around the body Each RBC carries 4 molecules of oxygen
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What’s in Blood? White Blood Cells aka Leucocytes fight infection and disease Allergies Digestive enzymes (macrophages) 1% of the blood
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What’s in Blood? Platelets Look like 2 plates stacked on top of each other. Smallest component of blood. Help to make clot. (clump together)
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What’s in Blood? Plasma 55% of blood is plasma (90% is water and 10% protein) Electrolytes (Na, K, Ca) Transports hormones Vitamins and Cholesterol through the body. CO 2 is transported to the lungs via plasma
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Ratio of RBC:WBC 1000:1 Leukocytes WBCs Made in the bone marrow and lymph system Contains nucleus Part of the immune system Combats foreign cells by phagocytosis Water 90% 10% minerals, vitamins, hormones, proteins, nutrients, antibodies, salt, oxygen, carbon dioxide, urea, uric acid and ammonia BLOOD Plasma (55%) the liquid part of blood Cells (45%) Platelets – involved in blood clotting Erythrocytes (RBC) Made in the bone marrow No nucleus Contain haemoglobin which transports oxygen Old RBCs are filtered and destroyed by the spleen.
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Textbook 7.2 COMPONENTS OF BLOOD (Page 246) Understanding Concepts
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