Chapter 2 & 3 Flashcards
A small muscular pouch like structure that fills the ventricles with blood
Atrium
A Lower chamber of the heart responsible for pumping blood to the lungs and entire body
Ventricle
A dividing wall or partition such as the one found between the two atria or between the two ventricles
Septum
The outermost layer of the heart
Epicardium
The middle muscular layer of the heart responsible for heart contraction
Myocardium
The innermost layer of the heart
Endocardium
A sac that encases the heart consisting of two layers and filled with a small amount of fluid that prevents friction with heart muscular action
Pericardium
One of three compartments inside the chest contains the heart and great vessels
Mediastinum
Decrease in length
Contract
The only arteries in the body that carry deoxygenated blood transport blood from the right ventricle of the heart to the lungs
Pulmonary Arteries
The largest artery in the human body which carries oxygenated blood away from the heart
Aorta
The only veins in the body that carry oxygenated blood delivering blood from the lungs to the left atrium of the heart
Pulmonary Veins
The arteries that supply oxygenated blood to the myocardium
Coronary Arteries
Supply with blood
Perfuse
A small mass of tissue, located in the right upper atrium, that serves as the heart’s primary pacemaker
SA Node
Specialized tissue that is able to regulate the impulses between atria and ventricles
AV Node
Complex process involving the opening of sodium and potassium channels on the surface of cardiac cells resulting in the loss of polarity
Depolarization
Slow heart rate
Bradycardia
A part of the conduction system responsible for receiving electrical impulses from the AV Node and transmitting the impulses to the bundle branches
Bundle of His
A small positive deflection that represents atrium depolarization the signal comes from the SA Nodes
P Waves
The lower pointed end of the heart
Apex
Part of the conduction system responsible for transmitting electrical impulses from the AV node to the Purkinje fibers to trigger ventricular depolarization
Bundle Branch
Fibers that serve to conduct electrical impulses through the right and left ventricles causing ventricular depolarization
Purkinje fibers