cardio anatomy & physio 1/17 Flashcards
AV valves closed during what part?
ventricular systole/contraction
amount of blood in ventricles after systole
50mL
amount of blood in ventricles after diastole
120mL
when does atrial kick occur?
last 1/3 of diastole, completes ventricular filling, last 20-30% end diastolic volume
when does blood circulate from aorta to myocardium via coronary arteries?
diastole
which coronary artery? blood supplies
- R atrium
- most R ventricle
RCA Right coronary artery
which coronary artery? blood supplies
- inferior wall L ventricle
- AV node
- bundle of His
RCA Right coronary artery
which coronary artery?
- SA node 60% of people
RCA Right coronary artery
which coronary artery?
- L ventricle
- has 2 main divisions
LCA
Left coronary artery
which coronary artery? blood supplies
- L ventricle
- L interventircular septum
LAD
left anterior descending artery
which coronary artery?
- inferior apex
- branches to R ventricles
LAD
left anterior descending artery
which coronary artery?
- blood to lateral and inferior wall L ventricle
- blood to part of L atrium
Circumflex LCx artery
which coronary artery?
- supplies SA node 40% of time
Circumflex LCx artery
which coronary artery? branches to
- Posterior interventricular artery
- R marginal artery
RCA
which coronary artery? branches to
- circumflex artery
- diagonal
LCA
which coronary artery? branches to
- Anterior interventricular artery
- L marginal artery
LCA
which coronary vein receives venous blood from heart? empties to what chamber?
coronary sinus
R atrium
what is main pacemaker of heart? where is it? impulse rate?
SA node
junction superior vena cava & R atrium
60-100bpm
SA and AV node innervated by sympathetic or parasympathetic innervation? what do they affect?
both
heart rate, strength of contraction
where is AV node? Firing rate?
R atrium and ventricle
40-60bpm
connection between AV node and purkinje fibers? firing rate of purkinje fibers?
AV node > AV bundle of His > split R and L bundle branches on both sides of interventricular septum
20-40bpm
heart has what type of muscle tissue?
striated muscle fibers with lots of mitochondria
what term -amount of blood ejected from heart with each contraction? normal range?
stroke volume SV
55-100mL/beat
what determines SV?
preload, L ventricular end diastolic volume
afterload
contractility
