6.2: Introduction To The Heart Flashcards
6 main components of the heart
Chambers : Atria (Left and Right)
Ventricles (Left and Right)
Great vessels:
Aorta
Pulmonary artery
Vena cava
Pulmonary vein / myocardium
Blood flow within the heart right
Blood enters right atrium of heart through vena cava
Passes the tricuspid valve into right ventricle
Ejected through pulmonary vein and pulmonary artery into lungs
Blond flow within heart left
Blood enters left atrium of heart through pulmonary veins
Passes through mistrial valve into left ventricle
Ejected through the aortic valve and the aorta into the body
The tricuspid valve transports blood from …
Right atrium to right ventricle
The pulmonary valve transports blood from…
The right ventricle to the pulmonary artery
The mitral valve transports blood from…
Left atrium to the left ventricle
The aortic valve transports blood from…
Left ventricle to aorta
Electrical activity of the heart
Primary pacemaker signal generated in Sinoatrial node
Transmitted across myocardium of atrium along internodal tracts
Slowing down of signal at AV node corresponds to [P-R] interval on surface of ECG trace
Transmission of electrical signal along purkinje fibres causes contraction of ventricles
Characteristics of sinoatrial node
Natural pace maker of the heart 60-100bpm
Location of SAN
Junction of crista terminalis; upper wall of right atrium and opening of superior vena cava
Characteristics of Atrioventricular node
Pace maker activity; slow calcium mediated action potential (only if SAN is not working)
Location if AV node
Triangle of Koch at base of right atrium
Characteristics of bundle of His
Specialised monocytes
Branches at intraventricular septum into apex
Characteristics of purkinje fibres
Specialised conducting fibres
Blood supply to left side of the heart
Left Circumflex artery
Left anterior descending
