Structure The heart is a hollow, four-chambered muscular organ that is specialized for pumping blood through the vessels of the body. It is located in the mediastinum where it is surrounded by a tough fibrous membrane called the ...
Review these concepts if necessary: Cardiovascular System: The Heart Cardiovascular System: The Heart Practice Problems
Vessels—Arteries, Capillaries, and Veins The walls of blood vessels are composed of the following tunics (layers): the tunica interna, an inner layer of squamous epithelium, called endothelium, resting on a layer of connective ...
Review these concepts if necessary: Cardiovascular System: Vessels and Blood Cardiovascular System: Vessels and Blood Practice ...