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Cardiac Circulatory (Full Article)

Cardiac Circulatory is an organ in the body in the form of a hollow, inverted cone-shaped muscle that functions as a pump in the cardiovascular system. The heart is an important organ in the human body because its function is to pump blood throughout the body. Blood needs to be constantly circulated to circulate oxygen and nutrients throughout the body and remove residues from the body. The following is an explanation of the circulation of blood that occurs in the heart.

Heart blood circulation

1. Blood Flow in the Heart

1.1 Blood Flow in the Right Heart

The right heart collects deoxygenated blood (poor oxygen and rich in carbon dioxide) from two veins namely the superior vena cava and inferior vena cava to the right atrium (atrium) of the heart. When the right atrium contracts, blood is pumped through the tricuspid valve into the left ventricle. Then when the left ventricle contracts, the tricuspid valve closes and blood is pumped into the lungs through the pulmonary arteries to release carbon dioxide and pick up oxygen.

1.2 Blood Flow in Left Heart

In the left heart, oxygenated (oxygen-rich) blood is received through the pulmonary veins into the left atrium. The blood is then pumped into the left ventricle through the mitral valve. From the left ventricle, blood is pumped into the aorta to be circulated throughout the body.

2. Coronary Circulation

Tissue in the heart also requires a supply of oxygen, nutrients, and remove metabolic waste as well as other tissues in the body. The blood supply to the heart is called the coronary circulation which consists of arteries, veins, and lymphatic vessels that are found all over the surface of the heart. Blood carries oxygen and nutrients to the myocardium via the intramyocardial branches.

Blood is received by the coronary circulation through the two arteries that are directly above the aortic valve. The left coronary artery immediately divides into two vessels, namely the left anterior descending artery and the left circumflex artery. The left anterior descending artery supplies blood to the anterior, external, and left ventricular septum. The left circumflex artery supplies the back and bottom of the left ventricle.

The right coronary artery supplies the right atrium, right ventricle, and the lower posterior portion of the left ventricle. The right coronary artery also supplies blood to the atrioventricular node in about 90% of people and the sinoatrial node in about 60% of people. The right coronary artery also passes through the back of the heart.

Most of the blood is removed through the cardiac veins adjacent to the coronary arteries. Cardiac veins drain into the coronary sinus which is a large vein that ends in the right atrium.

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