Blood vessels: organic conduits carrying blood to the heart and organs.
Connective tissue: tissue that connects and supports.
Smooth muscle tissue: smooth muscle.
Endothelium: cellular tissue covering the wall of an artery.
Epithelial cell: cell of the endothelium.
Valve: tissue that prevents the blood from flowing backwards.
White blood cell: free-floating blood cell that plays an important role in the immune system.
Red blood cell: free-floating blood cell that carries nutriments to the organs.
Capillary: small blood vessel that connects arteries to veins and allows exchange with the cells.
Vein: blood vessel that carries blood from the organs to the heart.
Artery: blood vessel that carries blood from the heart to the organs.