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  • It's AumSum Time.

  • The human heart.

  • Just look at this machine.

  • You remember him, right?

  • Yes.

  • It is Wall-E, the iconic robot who meets Eva and falls in love with her.

  • Have you ever been in love AumSum?

  • Yes.

  • I can see her now.

  • Two soft buns, cheese, tomato.

  • My Burger.

  • Anyways, which organ is associated with love?

  • The heart, right?

  • It is kind of obvious.

  • But the truth is our heart does not teach us to love.

  • And most important, it does not break apart when somebody leaves us.

  • Yeah.

  • It is true.

  • Our heart, the cone shaped organ is actually a complete workaholic.

  • Throughout our life time.

  • It tirelessly pumps oxygen and nutrient rich blood to all our body parts.

  • Just like a pumping machine.

  • Come on now.

  • Close your palm and form a fist.

  • Do not worry.

  • I am not asking you to fight.

  • Our fist is approximately how big our heart is.

  • It is located between our lungs, slightly tilted towards the left side.

  • It is enclosed in a double layered sac called pericardium.

  • Does it taste like Peri Peri Fries?

  • No AumSum.

  • What does a picture frame do?

  • It holds the picture in place, right?

  • Without the frame, the picture would fall off.

  • Just like that, the pericardium protects the heart.

  • By anchoring it to the surrounding tissue so that heart stays in place.

  • Pericardium also prevents the heart from overfilling.

  • Now, just like Captain America's shield is made of special alloy.

  • Our heart is made of special muscle cells called cardiac muscle fibers.

  • Now, let us dive in.

  • Just like a tennis net divides the tennis court into 2 parts.

  • The heart is also divided onto the left and the right side.

  • By a wall called cardiac septum.

  • The right side of the heart is filled with deoxygenated blood.

  • While, the left side is filled with oxygenated blood.

  • And this dividing wall prevents the blood from mixing.

  • Each side of heart further divides into two chambers.

  • The upper chambers are called atria.

  • While, the lower chambers are called ventricles.

  • Where are the sleeping chambers?

  • Stop it AumSum.

  • Let us first learn about atrium.

  • Now, just like a postbox receives letters from multiple people.

  • The atrium receives blood from different parts of the body.

  • Thus, the atria are simply receiving chambers.

  • They have thin muscular walls.

  • Why Thin?

  • Do they believe in size 0?

  • No AumSum.

  • Their walls are thin, not requiring a lot of muscle tissue.

  • Because they have to pump blood into ventricles present below them.

  • Now, moving onto the ventricle.

  • Just like the postman collects all the letters from the postbox.

  • And delivers them to their respective locations.

  • Ventricle also collects blood from the atrium.

  • And pumps it to different parts of the body.

  • Thus, the ventricles are called discharging chambers.

  • Just like coconuts have thick outer covering.

  • Ventricles have thick muscular walls.

  • Why Thick?

  • Because the walls need more muscle tissue.

  • To generate enough pressure, so as to pump blood out of the heart.

  • And distribute it to the entire body.

  • Now, left ventricle's wall is even more thicker than right ventricle's wall.

  • Because the right ventricle pumps blood only to the lungs.

  • While left ventricle has to pump to entire body, requiring more pressure than right ventricle.

  • Now, let us talk about the valves of the heart.

  • In total, we have 4 valves.

  • Tricuspid valve, bicuspid valve, pulmonary valve and aortic valve.

  • What happens when you hop onto a flight?

  • Can you just change your mind and ask the pilot to turn back?

  • No.

  • Same with the 4 valves of the heart.

  • They are fibrous flaps of tissue allowing the blood to flow in one direction only.

  • And then they close tightly, preventing the backflow of blood.

  • So, they basically act like security guards.

  • The tricuspid valve guards the opening between right atrium and right ventricle.

  • While the bicuspid valve guards the opening between left atrium and left ventricle.

  • Together, they are called atrioventricular valves.

  • Pulmonary valve guards opening between right ventricle and pulmonary artery.

  • While, aortic valve guards opening between left ventricle and aorta.

  • Together, they are called semilunar valves.

  • Atrioventricular, Semilunar.

  • Sounds like the names of some star trek guys.

  • AumSum.

  • So, that was all for the structure of the heart.

  • Now, let us understand its working.

  • But before that, let me ask you something.

  • Why is the heart so important?

  • Can't we survive without it?

  • Depends.

  • Can you survive without oxygen?

  • No right?

  • Who is the guy making sure that every cell of our body gets oxygen?

  • The heart.

  • It pumps blood through the entire body, supplying oxygen and nutrients to cells.

  • And removing carbon dioxide and waste materials from them.

  • This movement of blood through the entire body is called circulation of blood.

  • Let us understand this movement.

  • From different body parts, deoxygenated blood is collected and brought to the heart.

  • It enters right atrium through blood vessels called superior and inferior vena cava.

  • This deoxygenated blood now moves into the right ventricle.

  • Now, in order to purify blood, it is sent to the lungs via the pulmonary artery.

  • In the lungs, the blood is purified, that is, carbon dioxide is removed.

  • And oxygen is added to the blood.

  • Now, this oxygenated blood needs to be sent to all body parts.

  • So, let us take it back to heart, through the pulmonary veins into the left atrium.

  • From there, it flows into the left ventricle.

  • And now finally, through aorta, it leaves the heart and is sent throughout the body.

  • Thus, oxygenated blood is delivered to every cell.

  • This completes one cycle of blood circulation.

  • Now, deoxygenated blood is again collected, brought back to the heart.

  • And the cycle continues.

  • Did you know that.

  • The blood circulation between the heart and lungs is called pulmonary circulation.

  • While, the circulation between the heart and body parts is called systemic circulation.

  • Since blood flows twice through the heart in one circuit, it is called double circulation.

  • Well I am double awesome.

  • Because awesome flows constantly through me every second.

  • You are unbelievable AumSum.

It's AumSum Time.

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B2 US ventricle blood valve atrium pulmonary circulation

The Human Heart | #aumsum

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    AumSum posted on 2019/05/25
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