The Heart Flashcards
What vessel supplies oxygenated blood to the heart muscle?
Coronary arteries on the surface
Heart muscle
Is… which means it …
Cardiac muscle
Myogenic
Initiates own contractions
What prevents valves from turning inside out?
Tendinous cords attached to valves
Fibrillation
Uncoordinated contraction of atria or ventricles
SAN (sino-atrial node)
Heart’s pacemaker
Generates electrical activity
Initiates wave of excitation over walls and causes cardiac muscle to contract (atrial systole)
AVN (atrio-ventricular node)
Which is…
Conducts wave of excitation through ventricles
Delayed to allow time for atria to finish contracting
Fast heart rate
Tachycardia
Slow heart rate
Bradycardia
Atria more frequently beats than ventricles
Atrial fibrillation
3rd beat is an early ventricular
Ectopic heartbeat