Module 9 Flashcards
Preload
The volume of fluid remaining in the right ventricle
End of the diastolic pressure
βStretchβ
Afterload
Resistance left ventricle must over come to circulate blood
Heart has to overcome to edjuct blood
The squeeze
Peripheral vascular resistance
1/3
2/3
Systolic and diastolic ?
1/3 systolic
2/3 diastolic
Stroke volume
Is the amount of blood pumped with each contraction of the heart
Dependent on preload and afterload
Heart rate =
Is the number of heart contractions per minute?
Cardiac output
Is the amount of fluid pump by the heart each minute
Cardiac output formula
Co = sv x hr
Automaticity
Generates its own electrical impulses, without stimulation from nerves
Pacemaker
Intercalated discs
Discs that are responsible for automaticity in the heart
Excitability
Ability to respond to an electrical impulse
Conductivity
The ability to conduct excation through the cardiac muscle
Contractiliity
The ability to contract in response to stimulation
How blood flows in the heart
The dominant pacemaker
Sa node
Sa node rate
60-100
Av node rate
60-80
Branches of the av node rate
40-60
Purknje fibers rate
20-50
Which side of the purknje fibers have more branches
Left
Electrical impulses spread from the SA node through the ?
Left and right atrial
Electrical impulses spread from the bundle throughout the ?
Left and right ventricle
What transmits from the SA node signal from the atrium to the ventricles
Av node