Cardiac Cycle Flashcards
Define blood pressure
The force of blood against arteries
What is the cardiac cycle
The event of one heart beat
What is the resting HR of an untrained performer
70bpm
What is the Resting HR of a trained performer
40bpm
What is heart rate
The number of ventricular contractions per minute
What is stroke volume
The volume of blood pumped from heart in each beat
What is the SV of an untrained performer
70ml
What is the resting SV of a trained performer
100ml
What is cardiac output
SV X HR
What is the cardiac output of untrained and trained performers
5l/m
When does SV reach maximal levels
Iight - moderate intensity
What is diastole
The period of time where the heart relaxes and fills with blood
What is Venus return
How blood is returned to the heart
What is systole
Blood being ejected from the atrium
Why might stroke volume decrease as intensity increases to maximal intensity
As there is not enough time for diastole
What is the range for SV during submaximal intensity
120-200
What is the role of the Sino Atrial Node
To create its own cardiac impulse
Send cardiac impulses around walls of atria
What is atrial stystole
The cardiac muscles recieving an impulses and contracting
What is ventricular diastole
The ventricles filling with blood and relaxing
What is the role of the AV node
To delay the impulse so diastole can occur
What is ventricular systole
Ventricles contract and blood is ejected from the heart
What is the cardiac control centre
The part of the brain that regulates cardiac output
What does the sympathetic nervous system do
Increases heart rate via accelerator nerve