Your heart is a strong, muscular organ situated slightly to the left of your chest. It pumps blood to all parts of the body via a network-related of blood vessels by repetitively widening and also contracting. On average, your heart will certainly beat 100,000 times and pump around 2,000 gallons of blood each day.

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The heart is separated into a appropriate and also left side, separated by a septum. Each side has actually an atrium (which receives blood as it enters) and a ventricle (from which blood is pumped out). The heart has actually a complete of 4 chambers: appropriate atrium, appropriate ventricle, left atrium and also left ventricle.

The best side of the heart collects oxygen-depleted blood and also pumps it to the lungs, via the pulmonary arteries, so that the lungs have the right to refresh the blood with a fresh supply of oxygen.

The left side of the heart receives oxygen-well-off blood from the lungs, then pumps blood out to the remainder of the body"s tproblems, with the aorta.

Valves keep direction of blood flow

As the heart pumps blood, a series of valves open up and close tightly. These valves ensure that blood flows in only one direction, preventing backcirculation.

The tricuspid valve is situated between the right atrium and ideal ventricle.The pulmonary valve is in between the right ventricle and the pulmonary artery.The mitral valve is between the left atrium and left ventricle.The aortic valve is between the left ventricle and the aorta.
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Each heart valve, except for the mitral valve, has actually 3 flaps (leaflets) that open and close prefer gateways on a fence. The mitral valve has 2 valve leaflets.

The circulatory system

While the heart and lungs are the biggest organs of the circulatory system, the blood vessels are the longest. This extfinished network of stretchy tubes circulates blood throughout the body. Lhelp end-to-finish, your body"s blood vessels would extfinish around 60,000 miles. That"s even more than 21 road trips in between New York and also Los Angeles!

Arteries (in addition to smaller arterioles and microscopic capillaries) convey oxygen- and also nutrient-wealthy blood to the body"s tproblems. In rotate, veins lug nutrient-depleted blood back to the heart. Along the way, blood is routed through the kidneys and also liver, too, filtering waste commodities from the blood.

Electrical impulses keep the beat

The heart"s 4 chambers pump in an organized manner through the help of electric impulses that originate in the sinoatrial node (additionally dubbed the "SA node"). Situated on the wevery one of the ideal atrium, this little cluster of specialized cells is the heart"s organic pacemaker, initiating electrical impulses at a normal rate.

The impulse spreads through the walls of the appropriate and left atria, resulting in them to contract, forcing blood right into the ventricles. The impulse then reaches the atrioventricular (AV) node, which acts as an electric bridge for impulses to travel from the atria to the ventricles. From tright here, a pathmethod of fibers (the HIS-Purkinje network) carries the impulse right into the ventricles, which contract and pressure blood out of the heart.

Heart anatomy: By the numbers

1. Superior vena cava: Receives blood from the top body; delivers blood right into the right atrium.

2. Inferior vena cava: Receives blood from the reduced extremities, pelvis and also abdoguys, and delivers blood right into the best atrium.

3. Right atrium: Receives blood returning to the heart from the remarkable and also inferior vena cava; transmits blood to the best ventricle, which pumps blood to the lungs for oxygenation.

4. Tricuspid valve: Allows blood to pass from the best atrium to the ideal ventricle; prevents blood from flowing back right into the right atrium as the heart pumps (systole).

5. Right ventricle: Receives blood from the right atrium; pumps blood right into the pulmonary artery.

6. Pulmonary valve: Allows blood to pass right into the pulmonary arteries; avoids blood from flowing ago right into the ideal ventricle.

7. Pulmonary arteries: Carry oxygen-depleted blood from the heart to the lungs.

8. Pulmonary veins: Deliver oxygen-affluent blood from the lungs to the left atrium of the heart.

9. Left atrium: Receives blood returning to the heart from the pulmonary veins.

10. Mitral valve: Allows blood to circulation into the left ventricle; avoids blood from flowing back right into the left atrium.

11. Left ventricle: Receives oxygen-rich blood from the left atrium and also pumps blood right into the aorta.

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12. Aortic valve: Allows blood to pass from the left ventricle to the aorta; stays clear of backcirculation of blood right into the left ventricle.