Cardiovascular Disorders Flashcards
1
Q
What sac is the heart enclosed in?
A
pericardial sac
2
Q
What are the three layers of the heart?
A
epicardium (visceral pericardium)
myocardium (cardiac muscle)
endocardium (lining)
3
Q
What are the four heart valves?
A
Atrioventricular valves: 1. Tricuspid 2. Mitral Semilunar valves: 1. Aortic 2. Pulmonary
4
Q
What are three cardiac muscle characteristics?
A
No regeneration
Autorhytmicity
Thick LV wall
5
Q
What is autorhytmicity?
A
Impulses to start contraction are initiated within the cardiac muscle
6
Q
What happens during systole?
A
ventricles contract, blood forced up aorta and pulmonary artery, blood delivered to body tissues, atria relax
7
Q
What happens to diastole?
A
ventricles relax, atria contract, blood forced back into ventricles
8
Q
What happens at the alveolar capillaries during pulmonary circulation?
A
Exchange of O2 and CO2
