Flashcards
Circulatory Systems IV
Cards in this deck (26)
- 1Position of heartBetween lungs in mediastinum
- 2Why left lung smallerHeart bulges into it
- 3Subdivisions (7)Fibrous pericardium
Serous pericardium:
parietal layer (Epicardium)
visceral layer
pericardial cavity
Cavity of heart - 4Serous pericardium functionFacilitates movement w/ lubricating pericardial fluid
- 5Fibrous pericardium functionPrevents over-expansion
- 6Congestive heart failureAs heart weakens, must grow thicker to gen high pressure
May get too thick to allow sufficient expansion, max growth restricted by pericardium
Doesn't pump enough blood, so tissue signals heart to pump more
gets thicker, only space to expand is inwards, blood flow gets smaller etc. - 7Diagram of heartPulmonary artery
Aorta
Vena cava
Pulmonary trunk
Right atrium
Right ventricle
Left ventricle - 8Blood flow sequenceLV -> Aorta -> Sup/inf VC -> RA -> RV -> PT -> PA -> Lungs -> PV -> LA -> LV
- 9Red coronary arteriesArteries feeding heart wall - just above SLV in aorta
- 10Blue coronary vesselsVeins draining heart wall - enter RV via IVC
- 11Connections in coronary arteriesanastomosis, few
- 12Cell junctions in cardiomyocytescells linked via intercalated discs
adherens junctions link actin
desomosomes link intermediate filaments - 13Why atria thin walled?Don't have to pump blood far
- 14SVC/IVC blood supplyThorax/arms/head
Lower body parts/walls of heart - 15Valve btw. LA+LVBicuspid
- 16Valve btw. RA/VTricuspid
- 17Valve btw. RV/PTSemi-lunar - pulmonary
- 18Function of SLVprevent backflow of blood from PT/Aorta during ventricular diastole
- 19Where do SLV attach and how?To papillary muscles via Chorda tendinae
- 20Function of papillary muscles+chorda tendinaePrevent valves from being blown other way and causing backflow
- 21What is remarkable about the aortic SLV?Only ventricle to fill when heart is relaxed
- 22Histology of the heartEndocardium
Myocardium
Epicardium - 23Endocardium structuretrabeculae carnae
- 24Myocardiumstriated, myogenic, invol.
- 25Epicardiumconnt. + muscle fibres
- 26Foetal circulationForeman ovale bypasses lungs
Ductus arteriolus btw. Aorta+PT
O2 provided by placenta
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- User has deleted their subject information Flashcards on Circulatory Systems IV, created by Deleted user on 22/04/2018.
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- Created by J yadonknow · Apr 14, 2018
- Copied by J yadonknow · Apr 22, 2018
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