The Circulatory Pathway

Deoxygenated blood drains from peripheral tissues and enters the right atrium through the superior and inferior venae cavae.
Blood draining from the heart itself enters the right atrium through the coronary sinus. This blood mixes in the right atrium during ventricular systole and then flows across the tricuspid valve and into the right ventricle during ventricular diastole. When the right ventricle contracts, blood is ejected across the monic and into the main pulmonary artery, which then bifurcates into the left and pulmonary these branches their respective After multiple blood pulmonary capillaries where carbon dioxide is exchanged or oxygen across the alveolar-capillary membrane.

Oxygenated blood then drains from the lungs into the four pulmonary veins, which empty into the left atrium. During ventricular diastole, this blood flows across the open valve and into the left ventricle. With contraction, the blood is ejected across the aortic valve and into the aorta and is subsequently delivered to the various organs, where oxygen and nutrients are exchanged for carbon dioxide and metabolic wastes.

The heart itself receives blood through the left and right coronary arteries, These are the first arterial branches of the aorta and originate in left main root called the Valsaha, coronary art originates in the left sinus of and is a short vessel that bifurcates into the left anterior descending and the left circumflex Coronary arteries. The LAD travels across the surface of the hurt in the anterior interventricular groove toward the cardiac apex.

It supplies blood to the anterior and anterolateral left ventricle through its diagonal branches and to the anterior two thirds of the inventricular septum through its septal branches.