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Know the Major Human Body Systems
Structure and function of the cardio-vascular system http://www.uic.edu/classes/bios/bios100/lecturesf04am/circsyscomp_2.gif
Figure 1: http://www.uic.edu/classes/bios/bios100/lecturesf04am/circsyscomp_2.gif. Above is a diagram of the cardiovascular system in the human body.
The red blood cells, also known as erythrocytes, is the most numerous type of cell in the blood. Red blood cells are created by the marrow within our bones, and have the lifespan of approximately 3 months. The red blood cells also carry haemoglobin, which gives the blood its red colour, helps transport oxygen around the body. A singular red blood cell is biconcave in shape with no nucleus, with a depression in the centre of the cell.

Figure 2: http://images.medicinenet.com/images/illustrations/blood_cells.jpg. Above is the shape and structure of the red blood cells within the bloodstream inside the human body.
White blood cells, also known as leucocytes, are practically known as the ‘soldiers’ of the body. These cells help to fight off bacteria and viruses. The white blood cells are much bigger in size in contrast to the red blood cells. The white blood cells are crucial for the human body, because, without them, the body wouldn’t be able to fight off infection or disease. White blood cells are irregular in shape, which is helpful to engulf bacteria, and contains a nucleus. http://www.visualphotos.com/photo/2x4141022/white_blood_cell_coloured_scanning_electron_micrograph_sem_of_a_lymphocyte_cell_a_type_of_white_F0012103.jpg Figure 3: http://www.visualphotos.com/photo/2x4141022/white_blood_cell_coloured_scanning_electron_micrograph_sem_of_a_lymphocyte_cell_a_type_of_white_F0012103.jpg. Above is an image of the white blood cell found inside the human body.
Plasma, which is the fluid part of the blood, helps to make the blood a liquid. Plasma transports

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