Intro to the heart Flashcards
What are the main components of the heart?
- Atria (L&R)
- Ventricles (L&R)
- Aorta
- Pulmonary artery
- Vena cava
- Pulmonary veins
Do ventricles or atria have a larger capacity?
Ventricles
Where does blood enter into the heart and through what vessel?
Through the vena cava into the right atrium
Where is the tricuspid valve?
Between right atrium and right ventricle
Where is the pulmonary valve?
Between the right ventricle and pulmonary artery
Where is the mitral valve?
Between left atrium and left ventricle
Where is the aortic valve?
Between left ventricle and aorta
Where is the primary pacemaker signal generated?
Sinoatrial node
Describe the path of the primary pacemaker signal to cause ventricular contraction
Signal transmitted along myocardium of atria along the internodal tracts.
The ‘slowing down’ of the electrical signal at the AV node
Transmission of the electrical signal along the purkinje fibers causes contraction of the ventricles.
What does the ‘slowing down’ of the electrical signal at the AV node correspond to on an ECG trace?
corresponds to the [P-R] interval on a surface ECG trace.
Where is the sinoatrial node located?
Junction of crista terminalis; upper wall of right atrium & opening of superior vena cava
Where is the AV node located?
Triangle of Koch at base of right atrium
What are the 3 arteries around the heart? (left to right on diagram)
A = Circumflex artery
B = Right coronary artery
C = Left anterior descending
What are the 3 veins around the heart? (left to right on diagram)
Coronary sinus
Great cardiac vein
Middle cardiac vein
