where are blood cells formed in the human body ? how is oxygen and carbon dioxide transported by the blood ?
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blood cells are formed in bone marrow of a human body. It inside the bone. Oxygen carbon dioxideis transported by the blood as blood contain a red pigment called hemoglobin whose affinity to attract oxygen is more and also it helps in the transport of oxygen by taking it into the cell body as well as carbon dioxide is also stored in the cell body by the red pigment called hemoglobin.
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When we breathe in air the air enters alveoli .From alveoli through the process of diffusion the blood enters blood capillaries.
when it enters the blood it combines with haemoglobin to forms oxy haemoglobin. Then it transports to all the body parts. Then the cells absorb oxygen and release co2. Then the carbon di oxide enters the blood stream and passes through the alveoli and in to the atmosphere
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