The Heart Flashcards
First heart sound that occurs during ventricular systole ; A V valves closing
LUB
Second heart sound that occurs during ventricular diastole; P & A semilunar valves closing
DUB
Abnormal heart sound
MURMUR
AV valves close, semilunar valves open
Atria is relaxed while blood flows in
Ventricular pressure increases
Blood flows into pulmonary trunk and aorta
Ventricular systole / atrial diastole
AV valves open / Semilunar valves close
Blood flows into ventricles while relaxed
Atrial Systole / Ventricular Diastole
A group of cells that function as a unit
Syncytium
Atrial and Ventricular syncytium
Cardiac Conjunction System
SA Node -> Atrial Syncytium -> Junctional Fibers -> AV Node -> AV bundle -> Bundle branches -> Purkinje Fibers -> Ventricular Syncytium
Alter the activities of the SA and AV nodes
Autonomic Nerve Impulses
Two ions that influence HR
Potassium
Calcium
Decrease heart action
Parasympathetic impulses
Which circuit delivers oxygen to all body cells and carries away wastes
Includes aorta and branches
System of veins that return blood to right atrium
Systemic Circuit
Which circuit eliminates CO2 via the lungs and oxygenates the blood
Vessels carry blood from the heart to the lungs back to heart
Pulmonary Circuit
In the ECG, where does Atrial systole begin?
At the end of the p wave
The amount of blood pumped in a single heartbeat
Stroke Volume
The volume forcibly released from the ventricle per minute
Cardiac Output
