what is the composition of blood and explain its constituents ?
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plasma rbc red blood corpcells wbc and platelets it is red in colour and does not have any nucleas it lives for only two months wbc it helps provide immunity fights against infection it has nucleas it does not have any haemoglobin platelets it helps clotting the blood plasma it constitutes rbc wbc and platelets it is an intracellular fluid
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BLOOD CONSTITUENTS
◆ plasma :
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The pale liquid ( about 90% ) which contains the blood cells. It carries dissolved food for the body cells, waste matter and carbon-dioxide se created by them, antibodies to combat infection, and enzymes and hormones which controls body processes.
◆ Red Blood Cells :
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Also called red corpuscles or erythrocytes . Red, disc-shaped cells with no nuclei. They are made in the bone marrow and contains haemoglobin. This combines with oxygen in the lungs to form oxyhemoglobin, and the blood becomes bright red. The red cells pass the oxygen to the body cells by diffusion, and then return to the lungs with haemoglobin.
◆ Platelets or thrombocytes :
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very small , disc-shaped bodies with no nuclei, made in the bone marrow. They gather particularly at an injured area, where they are important in the clotting of blood.
◆ White Blood Cells :
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Also called white corpuscles or leucocytes . large , opaque blood cells, important in body defence . There are several types. lymphocytes, are made in lymphoid tissue and are found in the lymphatic system as well as blood. They make antibodies, other white cells - monocytes -are made in bone marrow . They swallow up foreign bodies, e.g, bacteria in a process called phagocytosis.
◆ plasma :
==================
The pale liquid ( about 90% ) which contains the blood cells. It carries dissolved food for the body cells, waste matter and carbon-dioxide se created by them, antibodies to combat infection, and enzymes and hormones which controls body processes.
◆ Red Blood Cells :
====================
Also called red corpuscles or erythrocytes . Red, disc-shaped cells with no nuclei. They are made in the bone marrow and contains haemoglobin. This combines with oxygen in the lungs to form oxyhemoglobin, and the blood becomes bright red. The red cells pass the oxygen to the body cells by diffusion, and then return to the lungs with haemoglobin.
◆ Platelets or thrombocytes :
========================
very small , disc-shaped bodies with no nuclei, made in the bone marrow. They gather particularly at an injured area, where they are important in the clotting of blood.
◆ White Blood Cells :
=======================
Also called white corpuscles or leucocytes . large , opaque blood cells, important in body defence . There are several types. lymphocytes, are made in lymphoid tissue and are found in the lymphatic system as well as blood. They make antibodies, other white cells - monocytes -are made in bone marrow . They swallow up foreign bodies, e.g, bacteria in a process called phagocytosis.
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