anatomy of heart C16 Flashcards
(24 cards)
cardiology
the study of the heart
precordium
anterior chest wall overlying the heart and great vessels
endocardium
innermost layer
myocardium
- middle layer of the heart
- thickest layer
- composed of cardiac muscle
epicardium
- outermost layer
- helps form the pericardium
pericardium
attaches the heart to the surrounding structures
atrium
upper chambers of the heart
ventricles
lower chambers of the heart
interatrial septum
separates the atriums
interventricular septum
separates the ventricles
great vessels
large vessels attached to the heart
AV valves (atrioventricular)
located between the atria and ventricles
semilunar valves
- control the outflow of blood from the ventricles
- exit valves
tricuspid valve
- 3 cusps
- right atrium - tricuspid valve - right ventricle
bicuspid valve (mitral valve)
- 2 cusps
- left atrium - bicuspid valve - left ventricle
pulmonic valve
- right semilunar valve
- right ventricle - pulmonic valve - pulmonary trunk
aortic valve
- left semilunar valve
- left ventricle - aortic valve - aorta
coronary arteries
- blood supply that supplies the myocardium
- resemble a crown encircling the heart
conduction system
SA & AV node blood supply
SA node
- pacemaker of the heart (sets the rate at which the heart beats)
- electrical signal that originates here is called the action potential / cardiac impulse
- located in the upper posterior wall of the right atrium
AV node
- acts as a path for the cardiac impulse to travel from the ACF into the ventricular bundle of His
- slows the cardiac impulse as it moves into the bundle of His
- located in the floor of the right atrium
automaticity
the ability of the pacemaker cells to generate their own electrical signal unassisted
rhythmicity
the regularity of the cardiac impulse
electrocardiogram (ECG)
the record of the electrical signals of the heart
