Your heart is a strong, muscular body organ situated slightly to the left of your chest. That pumps blood to all components of the body v a network the blood ship by continuously expanding and contracting. Top top average, her heart will beat 100,000 times and pump about 2,000 gallons the blood every day.

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The love is split into a right and left side, separated by a septum. Each side has actually an atrium (which receive blood as it enters) and also a ventricle (from i beg your pardon blood is pumped out). The heart has actually a complete of four chambers: best atrium, appropriate ventricle, left atrium and left ventricle.

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

The left side of the love receives oxygen-rich blood indigenous the lungs, climate pumps blood the end to the remainder of the body"s tissues, with the aorta.

Valves keep direction that blood flow

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

The tricuspid valve is situated in between the appropriate atrium and also right ventricle.The pulmonary valve is in between the best ventricle and also the pulmonary artery.The mitral valve is in between the left atrium and left ventricle.The aortic valve is between the left ventricle and also the aorta.

Each love valve, except for the mitral valve, has three flaps (leaflets) that open and close like gates on a fence. The mitral valve has two valve leaflets.

The circulatory system

While the heart and lungs are the largest organs the the circulatory system, the blood vessels space the longest. This extended network of stretchy tubes circulates blood transparent the body. To adjust end-to-end, your body"s blood vessels would extend around 60,000 miles. That"s an ext than 21 roadway trips between 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 through the kidneys and liver, as well, filtering waste products from the blood.

Electrical impulses store the beat

The heart"s 4 chambers pump in an arranged manner with the assist of electric impulses that originate in the sinoatrial node (also called the "SA node"). Situated on the wall of the appropriate atrium, this small cluster of devoted cells is the heart"s natural pacemaker, initiating electric impulses in ~ a common rate.

The advertise spreads with the wall surfaces of the right and also left atria, causing them to contract, forcing blood into the ventricles. The impulse then reaches the atrioventricular (AV) node, which acts together an electrical bridge for impulses to travel from the atria to the ventricles. Native there, a pathway of yarn (the HIS-Purkinje network) carries the impulse into the ventricles, i beg your pardon contract and also force blood out of the heart.

Heart anatomy: through the numbers

1. Remarkable vena cava: receive blood native the top body; it is intended blood into the best atrium.

2. Worse vena cava: receives blood native the reduced extremities, pelvis and abdomen, and also delivers blood into the ideal atrium.

3. Appropriate atrium: receives blood returning to the love from the superior and inferior vena cava; transmits blood to the ideal ventricle, i beg your pardon pumps blood to the lungs for oxygenation.

4. Tricuspid valve: enables blood to pass from the appropriate atrium to the right ventricle; stays clear of blood from flowing ago into the appropriate atrium as the heart pumps (systole).

5. Best ventricle: obtain blood indigenous the best atrium; pumps blood into the pulmonary artery.

6. Pulmonary valve: permits blood to pass right into the pulmonary arteries; stays clear of blood from flowing ago into the appropriate ventricle.

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

8. Pulmonary veins: deliver oxygen-rich blood indigenous the lungs to the left atrium that the heart.

9. Left atrium: receive blood return to the love from the pulmonary veins.

10. Mitral valve: permits blood to circulation into the left ventricle; avoids blood from flowing ago into the left atrium.

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

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