HEART Flashcards
heart’s location, above diaphragm, between the lungs
mediastinum
hollow, muscular organ
heart
innermost layer; endothelial tissues and lines the inside of heart and valves
endocardium
thickest layer; muscle fibers; pumping actions
myocardium
outer layer of the heart
epicardium
protect the heart’s wall
pericardium
- lubricate the surface of the heart
- reduce friction during systole
- contains parietal fluid
pericardial space
two layers of pericardium
visceral and parietal
contraction
systole
relaxation
diastole
ventricles contract and send blood out of the body
systole
ventricles relax and send fill up with blood from the atria
diastole
other term for diastole
period of ventricular filling
chambers relax simultaneously
diastole
starts with atrial then ventricular
systole
keep blood moving from one direction
valves
explosion of electrical activity that is created by a depolarizing current
action potential
