Heart Flashcards
Heart
Major function of the cardiovascular system
Transportation
Delivery route is through the heart…
vessels
Transport medium of the heart is through
blood
outermost loose fitting, superficial part of the sac
fibrous pericardium
What is the double sac wall that encloses the heart
pericardium
What are the roles of the fibrous pericaridum?
Protects the heart, anchors the heart to surrounding structures, prevents overfilling the heart with blood.
Deep to the fibrous pericardium
serous pericardium
lines the internal surface of the fibrous pericardium
pariteal layer
At the base of the heart the parietal layer reflect back covering the external surface of the heart
Visecreal layer or epipericardium
What two layers make up the serous pericardium?
Partieal layer and visecreal layer
What are the three layers that make up the walls of the heart
epicardium, myocardium, endocardium
The outer layer, which is also the visceral pericardium“upon the heart”
epicardium
Known as the “heart muscle”
Myocardium
Middle and thickest layer composed mainly of cardiac muscle
Myocardium
Known as the “inside of the heart”
Endocardium
Inner lining that covers the heart valves and is continuous with the inner lining of the great vessels
Endocardium
Continuous with the endothelial lining of blood vessels
Endocardium
How many chambers are in the heart
4
How are the four chambers of the heart divided?
2 superior atria and 2 inferior ventricles
divides the atria chambers
Interatrial septum
divides the ventricle chambers
interventricle septum
How are chambers of the heart divided ?
Longitudinally by a septum
eceiving chambers and ineffective pumps
Atria
Thick wall discharging chambers of the heart
ventricles
Two visible grooves on the surface indicating boundaries of chambers and carry blood vessels
cornary sulcus and the anterior interventricle sulcus
encircles junction of the atria and ventricles like a crown
cornary sulcus
what seperates the right and left ventricles
anterior interventricle sulcus
What are the four heart valves
Atrioventricular valves, semilunar valves, Tricuspid valve, mitral valve.
Valve between atrium and ventricle
Atrioventricular valve
Between the ventricle and great vessel
semilunar valve
right AV valve
Tricuspid valve
left AV valve
mitral valve `
results of depolarization waves traveling through the heart
heart contraction
The ability of the heart to beat is
insintrict
true or false: the heart beat does not depend on impulses from the nervous system
true
ensures the heart muscle depolarizes in an orderly and sequential manner
cardiac pacemaker cells
right atrium inferior to vena cava
SA Node
lower atrial septum at the junction of the A and
AV Node
in the interventricular septum
AV bundle
generates impulses
SA Node
The node in which the impulses pause
AV node
conducts impulses to the bundle branches
AV Bundle
conduct the impulses through the interventrical septum
Bundle branches
depolarizes the contractilecells of both ventricles
subendo cardial conducting network
a region between 2 waves
segment
a region that contains a segment and one or more waves
interval
