The Cardiac Cycle

Contraction

Systole
Relaxation

Diastole
___ contract while ____ relax, then ____ contract while ____ relax.

Atria, ventricles, ventricles, atria
Sounds: Lubb-dupp

Lubb=
Dupp=

Lubb= Ventricles contract, AV valves closing

Dupp= Ventricles relax, semilunars close
Behind right atrium
"Pacemaker"- initiates action potential

Sinoatrial (SA) node
Near septum between atrium & ventricles

Pauses the action potential to allow the atria to empty

Atrioventricular (AV) node
Found throughout the ventricles

Fiber spread the action potential. Cause ventricles to contract

Purkinje
Depolarization of atria (SA node initiating systole of atria)

P wave
Depolarization of the ventricles (contraction of ventricles)

QRS Wave
Repolarization (diastole of ventricles)

T wave
Epinephrine (adrenaline)

Increases contractions
High AND Low K+ or Na+

Decreases contractions
Body temperature- High

Increased contractions
Age- older

Decreased contractions
Gender- Male

Decreased Contractions
Symptoms of poor blood circulation.

Why does this happen?

Temp change, Fatigue, Fainting, Pale skin

This happens due to a lack of oxygen to muscles/ organs. Temp change is because blood carries heats

Author

GoBroncos

357700

Card Set

The Cardiac Cycle

Description

Updated

2022-02-15T02:48:15Z