ANATOMY

Detailed explanation-1: -Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body’s tissues through the aorta.

Detailed explanation-2: -Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart.

Detailed explanation-3: -Arteries carry blood away from the heart and into the organs – where it splits into arterioles, and further into capillaries. These then join to form venules, which join again to form veins, which carry blood back from an organ to the heart.)

Detailed explanation-4: -Oxygenated arterial blood circulates through the body via the vascular tree consisting of sequentially smaller arteries, arterioles, and capillary beds. Nutrients and waste exchange between the blood and body tissues occurs at the capillary bed.