Lab Practical Cow Heart

Terms in this set (31)

atria
blood enters heart
ventricles
expels blood received from atrium towards body/lungs
AV valves
prevent backflow of blood into atria upon contraction of ventricles
Semilunar valves
receive blood from ventricles and permit blood to be forced into arteries; prevent backflow from arteries into ventricles
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cranial (superior) vena cava
carries deoxygenated blood into heart (from head/arms/upper body)
caudal (inferior) vena cava
carries deoxygenated blood into heart (carrying blood from lower body)
right ventricle
pumps blood up through pulmonary valve and pulmonary artery to lungs
pulmonary artery
carries deoxygenated blood from right ventricle to lungs
pulmonary veins
carries oxygenated blood from lungs to L atrium of heart
left atrium
oxygen-rich blood from lungs enter; then pumped to L ventricle
left ventricle
thickest; responsible for pumping oxygenated blood to tissues all over body
aorta
main artery in human body; distributes oxygenated blood to all parts of body
foramen ovale
small opening between L and R atria
ductus arteriosus
blood vessel connecting main pulmonary artery to proximal descending aorta; allows most of blood from R ventricle to bypass fetus's fluid-filled non functioning lungs
aortic arch
portion of main artery that bends between ascending and descending aorta
umbilical arteries
carry deoxygenated, nutrient-depleted blood from fetus to placenta
SA node
heart's pacemaker; sends out regular electrical impulses from atrium causing it to contract and pump blood to ventricle
AV node
controls heart rate; delays impulses to ensure that atria have ejected blood into ventricles before ventricles contract
Purkinje fibers
specialized fibers that run to muscle tissue in bottom of ventricles; only electrical connection between atria and ventricles; ensures contraction begins at tip of ventricle and moves up (moves blood up and out of heart into pulmonary artery)
pericardium
thin membrane that encloses the heart
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ventricular septum
separates L and R ventricles
tricuspid valve
3 flap AV valve on the R side of heart
bicuspid (mitral) valve
2 flap AV valve on L side of heart
chordae tendineae
anchors AV valves; prevents valves from being turned inside out
papillary muscles
part of the wall of ventricle
aortic valves
semilunar valve located at openings of ventricles into aorta
pulmonary valves
semilunar valve located at openings of pulmonary artery
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