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What is the mechanism of human heart? How is transportation carried by it? Also, show through a labeled diagram.
What is the mechanism of human heart? How is transportation carried by it? Also, show through a labeled diagram.
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■WHAT IS HEART
☆Heart is the pumping organ that pumps out the blood out the blood the blood vessels.
☆A muscular organ whose size is a big as our fist.
■MECHANISM OF HEART
☆Left atrium receives oxygenated blood from the lungs via pulmonary vein .During this collection the left atrium relaxes.
☆It then contracts while left ventricle expands , so blood is transferred to it . As the left ventricle contracts next , the blood then is pump out for circulation to the body .
☆Deoxgenated blood enters to the right atrium as it expands . When the right atrium contracts the corresponding lower chamber , right ventricle dilates .
☆Deoxgenated blood thus enters in it , which inturn is pumped to lungs for oxygenation .
☆Valves are muscular flaps that prevent backflow of blood .
☆Septum a muscular wall , prevents mixing of oxygenated and deoxgenated blood .
■There are three main type of blood vessels which help in transportation of blood
⊙Arteries
⊙Veins
⊙Capillaries
☆Arteries have thick and elastic walls which carry blood at high pressure ( They do not have valves ) .They carry oxygenated blood from heart to various organs of the body except pulmonary artery .
☆Veins have thin walls and carry blood at low pressure ( They have valves to prevent backflow of blood ) .They collect deoxgenated blood from different organs of body to heart except pulmonary vein .
☆When the arteries gets divided into smaller and smaller vessels it's called as capillaries .
■IF YOU WANNA KNOW ABOUT DOUBLE CIRCULATION
☆Double circulation means the blood goes through the heart twice to supply blood once around the body .
☆It involves , pulmonary circulation i.e , movement of blood from heart to the lungs and back and systemic circulation is a circulation of blood from heart to different parts of body except lungs and back .
hope it helps u dear ^_^