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the heart
final
20
Anatomy
Undergraduate 3
12/09/2015

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Term
pulmonary circuit
Definition
to and from the lungs
Term
systemic circuit
Definition
to and from the body tissues
Term
atria
Definition
recieves from the pulmonary and systemic circuit
Term
ventricles
Definition
pump the chambers
Term
what is the largest organ of the mediasteinum?
Definition
heart
Term
layers of the pericardium (top to bottom)
Definition
fibrous pericardium
parietal layer of serious pericardium
pericardial cavity
epicardium
myocardium
endocardium
Term
external markings of the heart
Definition
coronary artery
anterior intraventricular sulcus
posterior intraventricular sulcus
Term
pectinate muscles
Definition
ridges inside of atrium
Term
the fossa ovalis was called what when youre an infant?
Definition
foramen ovale
Term
each valve is composed of
Definition
endocardium
Term
atrioventricular valves
Definition
is between the atria and ventricular
Term
function of fibrous skeleton
Definition
anchors valves
prevents overdilation of valves
main point of insertion for cardiac muscle
prevents spread of electrical impulses
Term
what is the sound of lub in lub dub?
Definition
AV valves closing
Term
what is the sound of dub in lub dub?
Definition
semilunar valves closing
Term
what happens in systole?
Definition
contraction of a heart chamber (ventricles)
depolarization
blood ejection
Term
what happens in diastole?
Definition
relaxation of the heart chamber (ventricles)
repolarization
blood fills up
Term
how does the myocardium contract?
Definition
using the sliding filament mechanism. happens when ions diffuse in it.
Term
what are cells of the cardiac muscle seperated by?
Definition
endomysium
Term
what ions causes the heart to contract?
Definition
calcium
Term
nerves to the heart are?
Definition
visceral sensory fibers
vagus nerve
sympathetic fibers
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