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What is the BASE of the <3?
the flat superior part
What is the APEX of the <3?
the inferior tip that points at an oblique angle
What is the SUPERIOR BORDER of the <3?
What is the RIGHT BORDER of the <3?
What is the LEFT BORDER of the <3?
What is the INFERIOR BORDER of the <3?
inferior wall of R atrium to the apex
What is the ANTERIOR SURFACE of the <3?
R atrium and R ventricle
What is the POSTERIOR SURFACE of the <3?
base, L atrium and L ventricle
What is the DIAPHRAGMIC SURFACE of the <3?
between the base and apex
Where is the CORONARY SULCUS?
between atria and ventricles
What is the Interventricular SULCUS?
divides the L and R ventricles
What is the FUNCTION of the ATRIA?
recieve blood that has to go to ventricles
What is the FUNCTION of the VENTRICLES?
propel blood around the circuits
What is an AURICLE?
lumpy wrinkled flap on atria that is expandable
What are VALVES?
folds of endocardium that extend between atria and ventricles
What is the FUNCTION of the VALVES?
open and close to prevent backflow and maintain a one-way flow of blood from atria to ventricles
Describe BLOOD FLOW through the RIGHT ATRIUM.
recieves oxygen poor blood from both venae cavae (from systemic curcuit)
What is the FORAMEN OVALE?
hole in heart from 5 weeks to 48 hours after birth
What is the FUNCTION of the FORAMEN OVALE?
permits blood flow directly from R and L atria while the lungs are developing.
What is the FOSSA OVALIS?
the depression that forms when the foramen ovale closes
What happens if the FORAMEN OVALE DOESN'T CLOSE?
- blood recirculates into pulmonary circuit
- reduces efficiency of circulation
- increases BP
- which means:
- <3 enlargement
- fluid buildup
- <3 failure
Describe BLOOD FLOW on the RIGHT VENTRICLE?
oxygen poor blood through tricuspid valve
What are CHORDAE TENDINEAE?
bundles of collagen fibers where where the cusps attach
What are PAPILLARY MUSCLES?
- cone shaped muscles on inner ventricular surface
- where chordae tendineae arise from
What is the FUNCTION of the CHORDAE TENDINEAE?
- limit movement of cusps
- prevent backflow from R ventricle to R atrium
What are TRABECULAE CARNEAE?
irregular muscular folds on internal surface of ventricle
What are the CONUS ARTERIOSUS?
superiot end of the R ventricle
Describe the CUSPS of the PULMONARY VALVE.
3 semilunar half moon shaped
What is the PULMONARY TRUNK?
the start of the pulmonary circuit
What is the FUNCTION of the PULMONARY VALVE?
prevent backflow of blood into right ventricle when chamber relaxes
Why does the LEFT VENTRICL have such a thick wall?
enabls it to develop enough pressure to force blood around entire systemic circuit
Why does the RIGHT VENTRICLE have a thinner wall?
it only has to push blood to the lungs and back to the heart
What is the function of the AORTIC SINUSES?
prevent individual cusps from sticking to walls of aorta when valve opens
Where do the CORONARY ARTERIES deliver blood?
to the myocardium
What are the COMPONENTS of the ATRIOVENTRICULAR VALVES?
- 1] ring of connective tissue that attaches fibrous skeleton of heart
- 2] connective tissue cusps
- 3] chordae tendineae
- 4] papillary muscles
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