What Type of Circulation Flows From the Heart to the Lungs and Back Again

17.second: Systemic and Pulmonary Circulation

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The cardiovascular system has two distinct circulatory paths, pulmonary circulation and systemic apportionment.

Learning Objectives

Distinguish between the systemic and pulmonary apportionment circuits

Fundamental Points

The cardiovascular system is composed of two circulatory paths: pulmonary circulation, the excursion through the lungs where blood is oxygenated, and systemic apportionment, the circuit through the rest of the body to provide oxygenated blood.
In the pulmonary circulation, blood travels through capillaries on the alveoli, air sacs in the lungs which allow for gas exchange.
As blood flows through apportionment, the size of the vessel decreases from artery / vein, to arteriole / venule, and finally to capillaries, the smallest vessels for gas and nutrient exchange.
Systemic and pulmonary circulation transition to the reverse type of circulation when they render blood to the opposite side of the eye.
Systemic circulation is a much larger and college pressure system than pulmonary circulation.

Key Terms

alveoli: Air sacs in the lungs that provide the surface for gas substitution between the air and capillaries.
pulmonary circulation: The office of blood apportionment which carries oxygen-depleted blood abroad from the heart, to the lungs, and returns oxygenated blood back to the heart.
systemic circulation: The function of claret circulation that carries oxygenated blood abroad from the heart, to the body, and returns deoxygenated claret back to the centre.

The cardiovascular system is composed of ii circulatory paths: pulmonary circulation, the circuit through the lungs where blood is oxygenated; and systemic circulation, the circuit through the residuum of the body to provide oxygenated blood. The two circuits are linked to each other through the center, creating a continuous cycle of blood through the trunk.

Pulmonary Apportionment

Pulmonary circulation is the move of blood from the centre to the lungs for oxygenation, and then back to the heart again. Oxygen-depleted blood from the body leaves the systemic circulation when it enters the right atrium through the superior and inferior venae cavae. The claret is then pumped through the tricuspid valve into the right ventricle. From the correct ventricle, blood is pumped through the pulmonary valve and into the pulmonary avenue. The pulmonary artery splits into the right and left pulmonary arteries and travel to each lung.

At the lungs, the claret travels through capillary beds on the alveoli where gas exchange occurs, removing carbon dioxide and adding oxygen to the blood. Gas substitution occurs due to gas partial pressure gradients across the the alveoli of the lungs and the capillaries interwoven in the alveoli. The oxygenated blood then leaves the lungs through pulmonary veins, which returns it to the left atrium, completing the pulmonary circuit. Equally the pulmonary circuit ends, the systemic excursion begins.

This diagram indicates the capillary beds, connective tissue, alveolar sacs, alveolar duct, mucous glands, mucosal lining, pulmonary vein, pulmonary artery, alveoli, and atrium.

Alveoli: A diagram of the alveoli, showing the capillary beds where gas exchange with the claret occurs.

This diagram of the pulmonary circuit indicates the left and right pulmonary arteries, left and right pulmonary veins, left and right atria, left and right ventricle, and heart muscle. Oxygen-rich blood travels into the veins; oxygen-poor blood travels through the arteries.

Pulmonary circuit: Diagram of pulmonary circulation. Oxygen-rich blood is shown in red; oxygen-depleted blood in bluish.

Systemic Circulation

Systemic circulation is the motility of claret from the heart through the body to provide oxygen and nutrients to the tissues of the body while bringing deoxygenated blood back to the center. Oxygenated claret enters the left atrium from the pulmonary veins. The blood is then pumped through the mitral valve into the left ventricle. From the left ventricle, blood is pumped through the aortic valve and into the aorta, the body's largest artery. The aorta arches and branches into major arteries to the upper body before passing through the diaphragm, where information technology branches further into the illiac, renal, and suprarenal arteries which supply the lower parts of the trunk.

The arteries branch into smaller arteries, arterioles, and finally capillaries. Gas and food exchange with the tissues occurs within the capillaries that run through the tissues. Metabolic waste and carbon dioxide diffuse out of the cell into the blood, while oxygen and glucose in the blood diffuses out of the blood and into the cell. Systemic circulation keeps the metabolism of every organ and every tissue in the body alive, with the exception of the parenchyma of the lungs, which are supplied by pulmonary circulation.

The deoxygenated blood continues through the capillaries which merge into venules, then veins, and finally the venae cavae, which drain into the right atrium of the heart. From the right atrium, the claret will travel through the pulmonary circulation to be oxygenated before returning gain to the system circulation, completing the cycle of circulation through the body. The arterial component of systemic circulation the highest claret pressures in the body. The venous component of systemic circulation has considerably lower claret pressure in comparing, due to their altitude from the eye, but contain semi-lunar valves to compensate. Systemic apportionment as a whole is a higher pressure arrangement than pulmonary circulation simply considering systemic circulation must force greater volumes of claret farther through the trunk compared to pulmonary circulation.

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Source: https://med.libretexts.org/Bookshelves/Anatomy_and_Physiology/Book:_Anatomy_and_Physiology_%28Boundless%29/17:_Cardiovascular_System:_The_Heart/17.2:_Circulation_and_Heart_Valves/17.2D:_Systemic_and_Pulmonary_Circulation

What Type of Circulation Flows From the Heart to the Lungs and Back Again

17.second: Systemic and Pulmonary Circulation

Fundamental Points

Key Terms

Pulmonary Apportionment

Systemic Circulation

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