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Divides the left and right sides of the heart to prevent mixing of oxygenated and deoxygenated blood.

Sites of the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues.

Transports oxygen, nutrients, hormones, and waste products throughout the body.

Carry oxygen from the lungs to the body's tissues and take carbon dioxide back to the lungs to be expelled.

Pumps blood to distribute oxygen and nutrients while removing carbon dioxide and waste products.

Small branches of arteries leading into the capillaries.

Assist in blood clotting to prevent excessive bleeding.

Prevent the backflow of blood and maintain unidirectional blood flow through the heart and veins.

Provides a protective sac around the heart, reducing friction as the heart beats.

Return deoxygenated blood back to the heart.

Part of the immune system; they help fight infection and disease.

Liquid part of blood; critical for transporting blood cells, nutrients, waste, and other substances.

Small vessels that gather blood from the capillaries into the veins.