Your heart is a strong, muscular body organ situated slightly to the left of her chest. The pumps blood come all components of the body with a network of blood ship by repetitively expanding and contracting. ~ above average, her heart will certainly beat 100,000 times and also pump about 2,000 gallons that blood every day.

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The heart is split into a right and also left side, separated by a septum. Every side has an atrium (which receives blood together it enters) and also a ventricle (from which blood is pumped out). The heart has actually a total of 4 chambers: best atrium, appropriate ventricle, left atrium and left ventricle.

The best side the the heart collects oxygen-depleted blood and also pumps it come the lungs, through the pulmonary arteries, so that the lungs have the right to refresh the blood v a new supply that oxygen.

The left side of the heart receives oxygen-rich blood native the lungs, then pumps blood out to the remainder of the body"s tissues, with the aorta.

Valves preserve direction the blood flow

As the love pumps blood, a collection of valves open and also close tightly. This valves ensure the blood flows in only one direction, staying clear of backflow.

The tricuspid valve is situated between the right atrium and right 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.

Each heart valve, other than for the mitral valve, has three flaps (leaflets) the open and close like gateways on a fence. The mitral valve has actually two valve leaflets.

The circulatory system

While the heart and also lungs space the biggest organs the the circulatory system, the blood vessels are the longest. This expanded network of stretchy tube circulates blood throughout the body. Set end-to-end, her body"s blood vessels would extend around 60,000 miles. That"s much more than 21 roadway trips between brand-new York and also Los Angeles!

Arteries (along with smaller sized arterioles and also microscopic capillaries) convey oxygen- and nutrient-rich blood to the body"s tissues. In turn, veins bring nutrient-depleted blood back to the heart. Follow me the way, blood is routed v the kidneys and liver, as well, filtering waste assets from the blood.

Electrical impulses store the beat

The heart"s 4 chambers pump in an arranged manner v the help of electrical impulses that originate in the sinoatrial node (also referred to as the "SA node"). Located on the wall surface of the appropriate atrium, this tiny cluster of devoted cells is the heart"s natural pacemaker, initiating electric impulses in ~ a common rate.

The impulse spreads through the walls of the right and also left atria, leading to them to contract, forcing blood right into the ventricles. The impulse then reaches the atrioventricular (AV) node, which acts as an electrical bridge because that impulses to take trip from the atria come the ventricles. From there, a pathway of fibers (the HIS-Purkinje network) dead the impulse into the ventricles, i m sorry contract and force blood the end of the heart.

Heart anatomy: by the numbers

1. Remarkable vena cava: obtain blood indigenous the upper body; delivers blood right into the ideal atrium.

2. Inferior vena cava: obtain blood native the reduced extremities, pelvis and also abdomen, and also delivers blood right into the ideal atrium.

3. Best atrium: receive blood returning to the heart from the superior and also inferior vena cava; transmits blood to the ideal ventricle, which pumps blood to the lungs for oxygenation.

4. Tricuspid valve: permits blood to pass from the appropriate atrium to the appropriate ventricle; prevents blood indigenous flowing earlier into the appropriate atrium as the heart pumps (systole).

5. Appropriate ventricle: receive blood from the ideal atrium; pumps blood right into the pulmonary artery.

6. Pulmonary valve: enables blood to pass into the pulmonary arteries; stays clear of blood from flowing earlier into the best ventricle.

7. Pulmonary arteries: lug oxygen-depleted blood indigenous the heart to the lungs.

8. Pulmonary veins: supply oxygen-rich blood indigenous 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 flow into the left ventricle; prevents blood native flowing earlier into the left atrium.

11. Left ventricle: obtain oxygen-rich blood native the left atrium and also pumps blood into the aorta.

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12. Aortic valve: permits blood to happen from the left ventricle come the aorta; stays clear of backflow the blood right into the left ventricle.