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Word Count: 607
Blood is composed of cells and fluid contain many inorganic and organic molecules Functions of blood could be falls into three categories transport defense and regulation they all have different function Blood transport oxygen and nutrients and removes waste from the body It also transports hormones which control the bodys organ Blood defense pathogens such as bacteria and viruses and it clots which prevents the loss of blood In regulatory functions blood helps maintain body temperature and the pH body fluids A molecule cells use in cellular respiration transport oxygen is called red blood cells Red blood cells also known as erythrocytes they are very small There are about 4 to 6 millions of red blood cells in our whole blood Its containing a respiratory pigment called hemoglobin Its carries oxygen and it is red in color In red blood cell its contains about 200 million hemoglobin molecules If we losing a big amount of hemoglobin in our blood our blood will become thicker so then is hard to pumping to our heart All blood cells are produced from stem cells with in the red bone marrow Stem cell which can divide and producing new cells into specific type of cells Red blood cells can only live for 120 days after that they will destroyed in the liver and spleen and there are about 2 million cells are destroyed per second Therefore an equal number much be produced to keep the cell count in balance People who are lack of hemoglobin will suffer from anemia Blood that playing the role of defends is the white blood cell White blood cells also known as leukocytes are differ from red blood cells Its fight infection they are more largely and being lack hemoglobin White blood cells are came from the stem cells in the red bone marrow They defend us against pathogens that have invaded into our body White blood cells
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