Question

Describe double circulation in human beings ? Why is it necessary ? Plzz answer . Class 10

Answer 1

Hey!!
in human beings the blood goes through the heart twice during each cycle i.e. The blood passes through the human heart twi times to supply once to whole body . So. It is called double circulation of blood.
the double circulation of blood includes:
1) pulmonary circulation
2) systematic circulation
importance / necessacity of double circualation:
the right side and the left side of the human heart is useful to keep oxygeanted and de- oxygenated blood from mixing. This type of separation of oxygenated and de-oxygeanted blood ensures a highly efficient supply of oxygen to the body. This is useful in case of human which constantly require energy to maintain their body temperature.
hope this will help u out

Answer 2

HERE IS YOUR ANSWER
______________________
The heart is muscular organ which is as big as our fist. Because both oxygen and carbondioxide have to be transported by the blood, the heart has different chambers to prevent the oxygen rich blood from mixing.

oxygen rich blood from the lungs cones to the thin walled upper chamber of the heart on the left, the left atrium.
the left atrium relaxes when it is collecting this blood. it then contracts, while the next chamber the left ventricle, expands, so that the blood is transferred to it
when the left ventricle contracts in its turn, the blood is pumped out to the body.


deoxygenated blood comes from the boat to the upper chamber on the right the right atrium as it expands.

as the right atrium contracts the corresponding lower chamber the right ventricle dilates.
this transfers blood to the right ventricle which in turn pumps it to the lung for oxygenation....

┬─┬ノ( º _ ºノ)
(｡’▽’｡)♡