short note on Double circulation in human.
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Ans. During a single cycle blood goes twice in the heart which is known asdouble circulation. It is necessary inhuman being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
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The pressure of blood flowing through a double circulation system can be higher than that flowing through a single circulatory system because in the case of double circulation the blood is pressurized twice per cycle around the whole blood system. (However, the blood pressure in a double circulatory system isn't twice that in a single circulatory system - it is not that simple because blood pressure in different parts of the heart varies according to the cardiac cycle and blood pressure around the body also varies e.g. according to the type and location of the blood vessel, and with the general state of health of the person or animal.)
The blood is pumped around the body after it has returned to the heart from the lungs. This is beneficial because blood pressure and flow rate is reduced as it passes through the lungs so if the blood wasn't returned to the heart and pumped onwards it would continue to the tissues of the body at much lower pressure and flow rate than it does in double circulation systems.
The separation of oxygenated (more accurately "oxygen-rich") and deoxygenated (more accurately "oxygen-poor") blood is possible in the cases of double circulation systems that include a 'double pump', i.e. a four chamber, heart.
See for example the diagram of a human heart shown above, which indicates the separation of oxygenated and deoxygenated blood within a human heart.
The pressure of blood flowing through a double circulation system can be higher than that flowing through a single circulatory system because in the case of double circulation the blood is pressurized twice per cycle around the whole blood system. (However, the blood pressure in a double circulatory system isn't twice that in a single circulatory system - it is not that simple because blood pressure in different parts of the heart varies according to the cardiac cycle and blood pressure around the body also varies e.g. according to the type and location of the blood vessel, and with the general state of health of the person or animal.)
The blood is pumped around the body after it has returned to the heart from the lungs. This is beneficial because blood pressure and flow rate is reduced as it passes through the lungs so if the blood wasn't returned to the heart and pumped onwards it would continue to the tissues of the body at much lower pressure and flow rate than it does in double circulation systems.
The separation of oxygenated (more accurately "oxygen-rich") and deoxygenated (more accurately "oxygen-poor") blood is possible in the cases of double circulation systems that include a 'double pump', i.e. a four chamber, heart.
See for example the diagram of a human heart shown above, which indicates the separation of oxygenated and deoxygenated blood within a human heart.
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