Answer:
In
human beings, the blood goes through the heart twice during each cycle i.e.,
the blood passes through the human heart two times to supply once to the whom
body. So, it is called double circulation of blood.
The double circulation of blood includes
(i) Systemic circulation
(ii) Pulmonary circulation (1)
(i) Systemic Circulation It supplies oxygenated blood from
left auricle to left ventricle, thereby pumping it to various body parts. The deoxygenated
blood is collected from the various body organs by the veins to pour the same
into vena cava and finally into the right-atrium (auricle). Right-atrium
transfers the blood into the right ventricle.
(ii) Pulmonary Circulation The deoxygenated blood is
pushed by the right ventricle into the lungs for oxygenation. The oxygenated
blood is brought back to left-atrium of the human heart. From left-atrium, the
oxygenated blood is pushed into the left ventricle. The left ventricle pumps oxygenated
blood into aorta for systemic circulation.
Necessity Double circulation of blood in human beings
prevents the mixing of oxygenated and deoxygenated blood. This allows a highly efficient
supply of oxygen to the body and provides constant energy to organisms to maintain
their body temperature. (2)
On their way, they saw a biker on the road who met an
accident and was bleeding profusely. Her mother stopped and helped
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