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Cardiovascular System (Cardiac Cycle (Conduction system (SA node -…
Cardiovascular System
Cardiac Cycle
Conduction system
SA node - pacemaker
AV node
Bundle of HIS
Purkinje fibres
Atrial Diastole
Ventricular diastole
Atrial Systole (SA node emits cardiac impulse across atria)
Ventricular systole - purkinje fibres contract from bottom - blood ejected from heart
cardiac hypertrophy
decreased resting bpm
reduced stroke volume
greater hr range
higher maximum Q
Impact of activity on health
Heart disease
High Blood pressure
Cholesterol
Stroke
Cardiac Dynamics
Heart Rate
bpm -
submaximal
maximal (220-age)
CV drift
Stroke Volume
the amount of blood ejected from the heart per beat (ml)
Cardiac Output
HR x SV
5 l/min at rest for everybody
control systems
Venous return
Volume of blood returning to the heart
skeletal muscle pump
respiratory pump
smooth muscle in veins
pocket valves
gravity
suction action of the heart
Blood redistribution
Vasodilation/vasoconstriction
precapillary sphincters
