The Circulatory System enables the heart to pump oxygen and nutrients in the blood throughout the body. Blood that has been deoxygenated is returned to the lungs to be reoxygenated. It also pumps waste products that must be transported to the kidney and liver. Your circulatory system is also responsible for temperature regulation and transporting cells (such as immune cells) and proteins.
Arteries are blood vessels that deliver blood to tissues. On the other hand, veins are blood vessels that return blood to the heart. They can be grouped into three: elastic arteries and large veins; muscular arteries and medium veins; and arterioles and venules.
Blood vessels have walls composed of three layers (or tunics): the tunica intima is the endothelium and loose connective tissue; the tunica media is the concentric layers of varying amounts of elastic fibers, smooth muscle cells, and collagen fibers; lastly, the tunic adventitia is the outer layer of connective tissue.
The Circulatory System enables the heart to pump oxygen and nutrients in the blood throughout the body. Blood that has been deoxygenated is returned to the lungs to be reoxygenated. It also pumps waste products that must be transported to the kidney and liver. Your circulatory system is also responsible for temperature regulation and transporting cells (such as immune cells) and proteins.
Arteries are blood vessels that deliver blood to tissues. On the other hand, veins are blood vessels that return blood to the heart. They can be grouped into three: elastic arteries and large veins; muscular arteries and medium veins; and arterioles and venules.
Blood vessels have walls composed of three layers (or tunics): the tunica intima is the endothelium and loose connective tissue; the tunica media is the concentric layers of varying amounts of elastic fibers, smooth muscle cells, and collagen fibers; lastly, the tunic adventitia is the outer layer of connective tissue.
Reference
Histology guide. Cardiovascular System | Microscope Slides | Histology Guide. (n.d.). Retrieved from https://histologyguide.com//slidebox/09-cardiovascular-system.html