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The heart and veins are both integral components of the cardiovascular system [1], [2], where the heart acts as the pump and veins serve as the vessels that return deoxygenated blood from the periphery back to the heart [3], [4], [5].

Facts (11)

Sources

Human body systems: Overview, anatomy, functions | Kenhub kenhub.com Kenhub 6 facts

claimVenules leave capillaries and increase in size to become veins, which return blood to the heart.

claimIn the human circulatory system, venules leave capillaries and gradually increase in lumen size to become veins on the way back to the heart.

claimThe main functional difference between arteries and veins is the direction in which they conduct blood: arteries convey blood from the heart to the periphery, while veins convey blood from the periphery to the heart.

claimSmall veins, called venules, originate from capillaries and gradually increase their lumen size as they travel toward the heart to end as veins.

claimVenules are small veins that leave capillaries and increase in lumen size to become veins as they return to the heart.

claimArteries convey blood from the heart to the periphery, while veins convey blood from the periphery to the heart.

7 Major Organ Systems: Functions and Connections instituteofhumananatomy.com Institute of Human Anatomy 2 facts

procedureSystemic circulation involves the left side of the heart pumping oxygen-rich blood through the aorta, which branches into smaller arteries and capillaries to exchange oxygen and nutrients with cells, before deoxygenated blood returns to the heart via veins.

quoteYour circulatory system, or cardiovascular system, supplies oxygen and nutrients to your whole body and removes waste through your blood. Your heart pumps blood that flows through your arteries, veins and capillaries. These blood vessels and your heart form your circulatory system. They work together to ensure your cells have what they need.

Organs in the Body: Definition & Anatomy - Cleveland Clinic my.clevelandclinic.org Cleveland Clinic 1 fact

referenceThe cardiovascular system consists of the heart as the main organ, along with major vessels like arteries and veins, and smaller vessels like capillaries.

List of systems of the human body - Wikipedia en.wikipedia.org Wikipedia 1 fact

referenceThe circulatory system circulates blood to transport nutrients, waste, hormones, oxygen, and carbon dioxide, and aids in maintaining pH and temperature, utilizing blood, the heart, arteries, veins, and capillaries.

Systems and organs | Anatomy and Physiology | Research Starters ebsco.com EBSCO 1 fact

claimThe venae cavae are the largest veins in the human body and empty blood into the right atrium of the heart.