Ch. 22: Heart Flashcards
Right pump- side of heart
Lungs-pulmonary v. to heart
Pulmonary circuit
Left side of heart
O2 deliver to cells to right heart
Systemic circuit
Name the four heart tissues
Pericardium
Epicardium
Myocardium
Endocardium
Serous membrane- dense irregular fibrous-sac, anchors heart, pericaridal cavity
Pericardium
visceral pericardium, heart surface
epicardium
heart muscle, multiple interlocking layers of cardiac muscle cells, intercalated discs= desmosomes+gap junctions (2 separate electrical units)
Myocardium
simple squamous, white sheet like lining
endocardium
What are the 2 separate electrical units of the myocardium?
atrial and ventricular units
What chamber receives oxygen-poor blood from the systemic circuit?
Right Atrium
Name the three veins that helps a chamber receive oxygen-poor blood from the systemic circuit
Superior Vena Cava
Inferior Vena Cava
Coronary Sinus
Vein opening from heart muscle is?
Coronary sinus
Foramen ovale during fetal development (48 hr seal)
A Depression
Fossa Ovalis
Open-blood flows into ventricle
Closed- ventricles going into systole
Tricuspid Valve
Chamber receives blood from right atrium and pumps it to lungs
Right Ventricle
L and R pulmonary Artery is attached (blue)
Pulmonary Trunk
Open to allow blood up, close so blood doesnt come back down
Pulmonary semilunar valve
L and R ventricle-irregular muscle folds or ridges on ventricle walls
Trabeculae carneae
Chamber that Receives oxygen-rich blood from lungs
Left atrium
Red, O2 int L. Atrium
Pulmonary veins
Chamber that pumps oxygenated blood into the body (Systemic circuit)
Left Ventricle
What are the two heart valves and what is their function(s)?
Tricuspid (R. atrioventricular) valve and Bicuspid (L. atrioventricular or mitral) valve
-prevent backflow of blood into the atria when ventricle contracts
collagen fibers that are stretchy strings on the heart
chordae tendineae
cone-shapped, anchoring chordae tendineae
Papillary Muscle
Open to allow blood out of ventricles, close cannot flow backward
Aortic semilunar valve and pulmonary semilunar valves
Cardiac cycle
1 heart beat every .8 seconds
systole- wringing and emptying
diastole- relaxing and filling
Conducting system (autorhythmic-elecrical signal)
SA node AV Node Bundle of His Through fibrous skeleton L and R bundle branches Perkinje fibers Ventricular myocardium
Coronary Circulation
heart’s blood vessels
