Chapter 19 - Heart

What are the layers of the heart? Describe each.

Pericardium: two layers, fibrous pericardium (dense CT) and serous pericardium. The visceral serous pericardium is also called epicardium.

Myocardium consists of cardiac muscle.

Endocardium is endothelium lining the internal walls of the heart.

Label this diagram and describe the flow of blood throughout

Superior vena cava, inferior vena cava, coronary sinus (deoxygenated blood) → right atrium → tricuspid valve → right ventricle → pulmonary valve → pulmonary trunk → lungs (blood gets oxygenated) → pulmonary veins → left atrium → mitral (bicuspid valve) → left ventricle → aortic valve → aorta → body

Label this diagram of the arteries of the heart

Label the diagram with veins of the heart

What is the conducting system of the heart? Describe the pathway

The conducting system is a series of specialized cardiac muscle responsible for conducting electrical signals to pump the heart. It goes SA node → internodal pathway → AV node → AV bundle → bundle branches → Purkinje fibers