Label the Heart & the Electrical Conduction System of the Heart

Sinoatrial (SA) Node

The pacemaker of the heart. This is where the electrical signal arises in normal sinus rhythm (NSR)

Atrioventricular (AV) Node

The electrical signal speeds from the conduction tissue in the atria to this structure. This is where the electrical signal arises in nodal rhythm.

Purkinje Fibers

These fast-conducting fibers spread the electrical signal throughout the ventricular wall.

Atrioventricular (AV) bundle (Bundle of His)

Specialized conduction tissue in the interventricular septum; divides into the right and left branches. It is a bundle.

Right and Left Bundle Branches

These are bundles. Electrical signal that speads over the Purkinje fibers.

superior vena cava

A vein that is the second largest vein in the human body and returns blood to the right atrium of the heart from the upper half of the body.

aorta

Largest artery in the body

branches of right pulmonary artery

left pulmonary veins

bring oxygen-rich blood from the left lung to the left atrium

right atrium

Receives deoxygenated blood from the body

right coronary artery

right ventricle

pumps blood to the lungs

inferior vena cava

A vein that is the largest vein in the human body and returns blood to the right atrium of the heart from bodily parts below the diaphragm.

aortic arch

curve of the aorta

branches of left pulmonary artery

pulmonary trunk

carries blood from right ventricle to pulmonary arteries

left atrium

receives oxygenated blood from the lungs

great cardiac vein

Name this vein.

left ventricle

pumps oxygenated blood to the body

tricuspid valve

valve between the right atrium and the right ventricle

bicuspid valve

valve between the left atrium and the left ventricle.

aortic semilunar valve

located between the left ventricle and the aorta

apex

pulmonary semilunar valve

heart valve opening from the right ventricle to the pulmonary artery

auricle

thin covering over the right and left atrium

Myocardium

Thick middle muscle layer of the heart

epicardium

outer layer of the heart

endocardium

membrane lining the cavities of the heart

pulmonary circuit

Pumps blood to the lungs and back to the left side of the heart

systemic circuit

Circuit of blood that carries blood between the heart and the rest of the body.