Flashcards in Lecture 18: The Cardiavascular System Part 1 Deck (12):
Pericardium. What are the 3 layers of the pericardium? What is each of their functions?
Superficial fibrous pericardium
-protects, anchors, and prevents overfilling
Deep two-layered serous pericardium
-parietal layer- lines the internal surface of the fibrous pericardium
-visceral layer- (epicardium) on external surface of the heart
-separated by fluid-filled pericardial cavity (decreases friction)
Refer to slide 7 for picture
What are the 3 layers of the heart wall?
1. Epicardium-visceral layer of the serous pericardium
-spiral bundles of cardiac muscle cells
-fibrous skeleton of the heart: crisscrossing, interlacing layer of connective tissue
-anchors cardiac muscle fibres
-supports great muscles and valves
-limits spread of action potentials to specific paths
-is continuous with the endothelial lining of blood vessels
Be able to label it!
-separated internally by the interatrial septum
-coronary sulcus (atrioventricular groove) encircles the junction if the atria and ventricles
-auricles increase atrial volume
-separated by interventricular septum
Be able to label the heart on slide 11
Atria: the receiving chambers
What vessels enter the right atrium?
What vessels enter the left atrium?
-superior vena cava
-inferior vena cava
-right and left pulmonary veins
Ventricles: the discharging chamber
What are the vessels leaving each ventricle?
What is the muscle called which projects into the ventricular cavities
Walls are rigid by?
-Walls are rigid by trabeculae carneae
-Papillary muscle projects into ventricular cavities
Vessels leaving right atrium:
Vessels leaving the left trunk:
Pathway of blood through the heart
Right atrium-tricuspid valve-right ventricle- pulmonary semilunar valve- pulmonary trunk -pulmonary arteries-lungs-pulmonary veins-left atrium- bicuspid valve- left ventricle- aortic semilunar valve- aorta- systemic circulation
Equal volumes of blood are pumped to the pulmonary and systemic circuits
-pulmonary circuit is short, low pressure circulation
-anatomy of the ventricles:
Left wall is thicker
-right and left coronary (in atrioventricular groove)
-small cardiac, anterior cardiac, and great cardiac veins
Be able to label the blood vessels of the heart.
Angina pectoris: thoracic pain caused by a deficiency in blood delivery to the myocardium
Myocardial infarction: (heart attack)
-prolonged coronary blockage
-areas of cell death are repaired with non contractile scar tissue