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UB ANA 113 Lec 21

Heart I

great vessels carry blood to and from heart
base where great vessels attach - superior
apex inferiorlateral
beginnings of fetal heart straight tube, 2 chambers. Venous(inferior) becomes atria, arterial (superior) becomes ventricle
septa(septum) divide heart into 4 chambers, develop @ 4 weeks
interventricular septum divide right ventricle from left
interarterial septum divide atria, not completely developed in fetal heart
foramen ovale hole during development between R and L atria. closes early so oxy and deoxy blood dont mix
septal defect septum doesnt form properly. results in cyanotic "blue baby"
fossa ovale depression when foramen ovale closes
pericardium double walled sac. Tough CT around heart
visceral pericardium inner layer of sac. "skin on apple"
parietal pericardium outer sac around heart
pericardial cavity space between pericardial coverings
serous fluid lessens friction due to pumping. Thin layer
Pericarditis inflammation of serous membranes. Fluid accumulates in cavity
superior vena cava drains superior region
inferior vena cava drains inferior region
coronary sinus drains venous blood from coronary circulation
What drains into the right atrium superior vena cava, inferior vena cave, coronary sinus
Tricuspid valve(right AV valve) blood moves through from right atrium to right ventricle
papillary muscles from wall of heart, fingerlike, prevent valve inversion, stabilize. In ventricles
chordae tendinae prevent valve inversion
pulmonary semilunar valve blood goes through when traveling from right ventricle to pulmonary trunk
blood passes from the pulmonary trunk to... 2 pulmonary arteries
What is special about the pulmonary arteries? Only arteries that carry deoxygenated blood. Take blood to lungs
What is special about the pulmonary veins? Only veins that carry oxygenated blood. Take blood from lungs
How many pulmonary veins are there? 4 total, 2 on each side
How does blood get from the left atrium to the left ventricle? Through the bicuspid valve. (Left AV). (Mitral valve)
Where is cardiac muscle the thickest? In the left ventricle because it need to push against gravity to the whole body
Aortic semilunar valve from base of aorta through this to the arch of aorta
Created by: HugsAndKisses



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