Coronory Arteries And Internal Heart Flashcards
Where do the L R coronary arteries arise from
Ascending aorta
Cardiac veins return Venus bood to the coronary _____ in R atrium
Sinus
Which nodes in the heart do branches R coronary artery supply
Sinoatrial
Atrioventricular
Which branch of the R coronary artery supplies the inferior border is the heart
Right marginal
What is the name of the continuation of the coronary after on the inferior/diaphragmatic surface of heart
Posteriori inter-ventricular artery
Left coronary artery branches to 2 terminal branches, what are they
Anterior interventricular (LAD)
Circumflex
Which artery does the L marginal artery that supplies the L ventricle arise from
Circumflex
What arteries can posterior interventricular arise from
L or R coronary
Origin of posterior interventricular can be
A left dominant
B Right sim
C either
C
Why is it important clinically if someone has Right dominant circulation
Occlusion of the L main stem would impair blood flow to part of it but not entire L ventricle
Why is it important clinically if someone has Left dominant circulation
If an occlusions occurred on left main stem, entire left ventricle could be blocked off
What do the valves in the heart ensure
Unidirectional flow
Main internal features of R atrium
Interatrial septum
Fossa ovalis
Crista terminalis
What is the fossa ovalis in R atrium
Depression in the septum from foetal foramen ovals
What is the crista terminalis in R atrium
-Muscular ridge separating smooth walled posterior let of atrium from anterior parts which are ridged (pectinate muscles)
List main structure in Right ventricle
Interventricular septum
Trabeculae cernaea
Papillary muscles
Chordae tendineae
Moderator band
In the R ventricle what is the trabeculae carnae
Muscular riddles in internal wall
Describe the chordae tendinea in R ventricle
Fibrous Corte connecting tips of papillary muscles to tricuspid valve
Describe the moderator band in the R ventricle
Modified region of trabeculaea caress which connects suptum to 1 of the papillary muscles
Left atrium receives —— blood from lungs via pulmonic veins
Deox
List the main structures of the left ventricle
Trabeculae carneae
Papillary muscles (2)
Chordae tendineae
In left ventricle what does the Chordae tendineae do
Connect my papillary muscles to mitral valve’s
When ventricles contact this is called ventricular______
A) Diastole
B) systole
B
Which valves are the semi lunar
Aortic and pulmanory
What is the asculatory region of the aortic valve
2nd intercostal space R of the sternum
What is the ascultatory region for pulmanory valve
2nd intercostal space L of the sternum.
What is the auscultatory region of tricuspid
5th intercostal space L of sternum
What is the auscultatory area for mitral
5th intercostal L mid clavicular line
The SA node is the____ of the heart
Pacemaker
What structures does the cardinal conduction system include
SA node
AV node
AV bundle
Purkinje fibres
Describe the conducting system of heart
-Action potential created by SAN
-Wave of excitation spreads across atria causing contraction
-impulses are conducted to AVN to the AVB
-AVB is split into 2 bundle branches giving rise to purkinje fibres in ventricles cause ventricles to contract
A SA node supplied by R coronary artery is in approx __% of people
60
A SA node supplied by L coronary artery is present in __% people
40
In most people the ______ coronary arteries supplied AVB
Left
In most people the AV node is supplied by _______ interventricular artery
Posterior
_____ stimulation increase the hearts rate and force of contraction
A) parasympathetic
B)sympathetic
B
_____ stimulation decreases the hearts rate and force of contraction
A) sympathetic
B) parasympathetic
B
