The middle layer of the heart wall; composed of cardiac muscle

The double-walled sac enclosing the heart and the bases of the great vessels

What term refers to the heart’s ability to initiate its own electrical impulse?

Starting when deoxygenated blood is returned to the heart from the body, what is the correct progression of blood through the heart and lungs?

Which artery supplies blood to the front and main wall of the left ventricle?

Which heart valve controls the flow of blood between the left atrium and the left ventricle?

This chamber receives oxygenated blood from the lungs via the pulmonary veins

The heart is located within this small cavity, within the thoracic cavity:

These strands of fibrous connective tissue connect the AV valves to the muscle of the ventricle:

This structure, made of semi-rigid fibrous connective tissue, encircles each heart valve, providing structure and stability:

These structures, unique to cardiac muscle, allow the muscle to stand up to the pressure of blood pumping, and also allow for swift conduction of electrical impulses from one cell to another: