Coronary artery circulation Flashcards
finish the sentence
coronary arteries supply the …… with O2
myocardium
where does the left coronary artery arise from
aorta , above the left cusp of the aortic valve
where does the right coronary artery originate from
above right cusp of aortic valve and travels down right coronary sulcus towards the crux of the heart
what does the left coronary artery branch into
left anterior descending artery LAD
Left circumflex artery - left marginal artery is a branch of artery
right coronary artery branches into what
PDA - posterior descending artery - right dominant
right marginal artery
posterior inter ventricular artery
where does the right coronary artery supply
RV, RA, and SA and AV nodes which regulate the heart rhythm
what are the papillary muscles and where are they located
The papillary muscles are muscles located in the ventricles of the heart. They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
where does the left marginal artery supply
left ventricle
where does the right marginal artery supply
right ventricle and the apex
where does the left circumflex artery supply
left atrium and posteriolateral left ventricle, anterolateral papillary muscle , SA node
where does the left anterior descending artery supply
supplies the right venticle, left ventricle and antihero 2/3 of interventricualar septum
what does the posterior interventricualr artery supply
supplies right and left ventricles and the poster 1/3 interventricular septum, papillary muscle to tricuspid and mitral valves
what does the left coronary artery supply
LAD, LCX and left marginal
what is the coronary sinus
a collection of veins joining together, draining blood from myocardium
where does the coronary sinus drain into
Drains into RA at coronary sinus orifice (between IVC and tricuspid valve)
there are 5 tributaries which drain into the coronary sinus - what are they
great cardiac vein - apex to interventicrular groove
small cardiac vein - anterior right side
middle cardiac vein - posterior surface
final two on psoteiro side of the heart
left marginal vein
left posterior ventricular vein
How is an electric signal conducted
SAN generates impulses these pause at AVnode and then the atrioventricular bundle connects the atria to the ventricles
the bundle branches conduct the impulses through the interventricualr septum
the purkinje fibres depolarise the contractile cells of both ventricles
Electrical signals arising in the SA node (in the
RA) stimulate the atria to contract (1)
Then the signals travel to the atrioventricular node (in the interatrial septum) (2)
After a delay, the electrical signal
diverges and is conducted through the
left and right bundle of His (3)
To the respective Purkinje Fibres
These signals are generated rhythmically, which in turn
results in the coordinated rhythmic contraction and relaxation
of the heart.
chemoreceptors near bifurcation of carotid artery. Detect changes in pp02 and ppCO2.
where are these found ?
feedback via what nerve
carotid body
glossopharyngeal nerve
chemoreceptors in aortic arch, sends feedback via afferent branches of vagus nerve.
are found where
aortic body
baroreceptors at base of internal carotid artery, innervated by a branch of glossopharyngeal.
are found where
carotid sinus
autonomic control of heart rate and blood pressure is controlled by what nerves
parasympathetic - vagus
symptrtheic - accelerator nerves
what is the p wave
atrial depolarisation
QRS complex
ventricular depolarisation
t wave
ventricular repolarisation
