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In contemporary physiology, red coloured fraction of blood is considered as rakta dhatu. The colourless fluid (plasma) is considered as rasa dhatu. Thus, rasa and rakta together form “blood”. The red fraction or red blood corpuscles are referred to as rakta dhatu in this article.
In contemporary physiology, red coloured fraction of blood is considered as rakta dhatu. The colourless fluid (plasma) is considered as rasa dhatu. Thus, rasa and rakta together form “blood”. The red fraction or red blood corpuscles are referred to as rakta dhatu in this article.
===Composition:===
===Composition:===
Blood is a complex liquid tissue composed of different types of cells. The plasma which represents the matrix of this tissue constitutes over 55% of it. Formed elements that are suspended in the liquid matrix constitute over 45% of blood, these comprise of erythrocytes,leukocytes, and platelets.<ref name=dwaraka>Dwarkanath C. Introduction to Kayachikitsa. Chaukhambha Orientalia. Varanasi; 1996. Third edition.pg.343</ref> The characteristic color of blood is due to the erythrocytes present in it. These cells are formed in the red born marrow and they survive for about 80 days in circulation and then disintegrate. Their debris is removed from the blood by liver and spleen.</ref name=dwaraka> Ranjaka pitta which gives color to rakta may be considered as the ayurvedic analogue of the red cobalt linked enzyme B12 present in the liver.
Blood is a complex liquid tissue composed of different types of cells. The plasma which represents the matrix of this tissue constitutes over 55% of it. Formed elements that are suspended in the liquid matrix constitute over 45% of blood, these comprise of erythrocytes,leukocytes, and platelets.<ref name=dwaraka>Dwarkanath C. Introduction to Kayachikitsa. Chaukhambha Orientalia. Varanasi; 1996. Third edition.pg.343</ref> The characteristic color of blood is due to the erythrocytes present in it. These cells are formed in the red born marrow and they survive for about 80 days in circulation and then disintegrate. Their debris is removed from the blood by liver and spleen.<ref name=dwaraka></ref> Ranjaka pitta which gives color to rakta may be considered as the ayurvedic analogue of the red cobalt linked enzyme B12 present in the liver.
===Color: ===
===Color: ===