NSG 132 CC Course Cardiac Basics-Questions with Correct Answers/ Verified/ Latest Update
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Course
NSG 132
Institution
NSG 132
endocardium - serous membrane that lines the heart and extends out to form the heart
valves
myocardium - muscular layer of the heart capable of contraction and conduction
pericardium - 2 layer fibrous sack around the heart.
pericardium details - non-compliant fibrous sack, 10ml of pericardial f...
NSG 132 CC Course Cardiac Basics-Questions with
Correct Answers/ Verified/ Latest Update
endocardium - ✔✔serous membrane that lines the heart and extends out to form the heart
valves
myocardium - ✔✔muscular layer of the heart capable of contraction and conduction
pericardium - ✔✔2 layer fibrous sack around the heart.
pericardium details - ✔✔non-compliant fibrous sack, 10ml of pericardial fluid
pericardium function - ✔✔holds the heart in place
provides a barrier to infection
does NOT allows heart to overextend
Right Coronary Artery - ✔✔Supplies R Atria and Ventircle & inferior wall of the L ventricle
(Posterior portion of the heart in 85% of people)
Supplies papillary muscle (mitral valve)
Supplies SA node in 60% of patients
Supplies AV node in up to 85% of patients.
Left Coronary Artery - ✔✔Mainstem
Left Circumflex
Left Anterior Descending
LAD supplies - ✔✔Anterolateral LV, apex and septum
LCX supplies - ✔✔posterolateral LV and Anterolateral papillary muscle (mitral valve)
SA node in 40% of population
, CO=??? - ✔✔Stroke volume x HR
Cardiac Output - ✔✔amount of blood ejected by the heart per minute
Normal Cardiac Output - ✔✔4-8 L per minute AT REST
What controls the HR? - ✔✔Bainbridge reflex
Baroreceptors
Dpoaminergic receptors
Bainbridge relfex - ✔✔receptors in the R atrium: when atrium pressure rises> reflex
tachycardia to prevent R atrial overload
Baroreceptors - ✔✔located in the aortic arch and carotid sinuses:
HIGH SBP causes a SLOWING of the HR
LOW SBP causes an INCREASED HR
Dopaminergic receptors - ✔✔stimulation causes an ELEVATION in HR
FEVER - ✔✔increases HR because of an increased need for O2 caused by increased
metabolic rate.
HYPOTHERMIA - ✔✔decreases HR because of slowed metabolic rate and reduced need for
O2.
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