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53 terms

Lab Quiz Heart

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papillary muscles
Structure from which chordae tendinae originate
tricuspid valve
Prevents blood movement from right ventricle to right atrium
pericardial sac
Membranes around the heart
mitral valve
Prevents blood movement from the left ventricle to left atrium
pulmonary trunk
Gives rise to left and right pulmonary arteries
coronary artery
Drains blood from myocardium into the right atrium
endocardium
Inner lining of heart chamber
myocardium
Layer largely composed of cardiac muscle tissue
pericardial cavity
Space containing serous fluid to reduce friction during heartbeats
cardiac vein
Drains blood from myocardial capillaries
coronary artery
Supplies blood to heart muscle
aorta
Distributes blood to body organs except the lungs
P Wave
Depolarization of atrial fibers
P-Q (P-R) Interval
Time for cardiac impulses from SA node through AV node
QRS Complex
Depolarization of ventricular fibers
S-T Segment
Time for ventricles to contract
Q-T interval
Time from ventricular depolarization to end of ventricular repolarization
T wave
Repolarization of ventricular fibers
About 70%
About what percentage of blood passes into the ventricles before the atrial walls contract?
Systole
What is the period during which a heart chamber is contracting called?
Diastole
What is the period during which a heart chamber is relaxing called?
During ventricular contraction
When are the AV valves (tricuspid and mitral valves) closed?
During ventricular relaxation
When are the AV valves open?
When the pressure in the ventricles exceeds the pressure in the pulmonary trunk and aorta.
When do the pulmonary and arotic valves open?
Vibrations in heart tissues created by changes in blood flow.
What causes heart sounds?
When the AV valves are closing.
When does the first sound of a cardiac cycle occur?
When the semilunar valves are closing.
When does the 2nd sound of a cardiac cycle occur?
A Murmer
What is the sound called when blood leaks back through an incompletely closed valve?
Specialized Cardiac Muscle Tissue
What are the fibers of the cardiac conduction system called?
The SA node (Sinoatrial node)
Under normal circumstances, what serves are the pacemaker of the heart?
in the inferior portion of the interatrial septum
Where is the AV (atrio ventricular) node located?
The AV bundle
What do the large fibers on the distal side of the AV node makeup?
Purkinje fibers
What are the fibers that carry cardiac impulses from the interventricular septum into the myocardium called?
An electrocardiogram
What is a recording of electrical changes occuring in the myocardium during the cardic cycle called?
Polarized
Between cardiac cycles, cardiac muscle fibers remain __?__ with no detectable electrical changes.
The P wave
What wave corresponds to depolarization of the muscle fibers of the atria?
Ventricles
The QRS complex corresponds to de-polarization of the muscle fibers in the__?__.
Ventricles
The T wave corresponds to repolarization of the muscle fibers in the ___?___.
Atrial repolarization occurs at the same time as ventricular depolarization. The QRS complex hides atrial repolarization.
Why is atrial repolarization not observed in an ECG?
Tachycardia
What is a rapid heart beat called?
Bradycardia
What is a slow heart beat called?
Aorta
What distributes blood to body organs (systemic circuit) except lungs?
Cardian Vein
What drains blood from myocardial capillaries?
Coronary Artery
What supplies blood to heart muscle?
Coronary Sinus
What drains blood from myocardium into the right atrium?
The Endocardium
What is the inner lining of the heart chamber called?
The mitral valve A.K.A. bicuspid valves
What prevents blood movement from the right ventricle to the right atrium?
Myocardium
What is the layer largely composed of cardiac muscle tissue?
The papillary Muscle
What is the structure from which the Cordae Tendineae originate?
Pericardial cavity
What is the space called that contains serous fluid that reduces friction during heartbeats?
Pericardial sac
What are the membranes around the heart called?
The pulmonary trunk
What structure gives rise to the left and right pulmonary arteries?
Tricuspid valve a.k.a. right atrioventricular valves
What prevents blood movement from right ventricle to right atrium?