Cardiovascular system Flashcards
Cardiac cycle
the way the heart works to pump blood around the body
Diastole
passive filling of the heart with blood
How long does diastole last?
0.5 seconds
Atrial systole
where the atria contract and force the remaining blood into the ventricles
How long does atrial systole take?
0.1 seconds
Ventricular systole
where the ventricles contract and force blood out through the arteries
How long does ventricular systole last?
0.2 seconds
State the order of the conduction system
SA node, AV node, bundle of HIS, purkinje fibers
What does the AV node do?
delay the impulse for 0.1 seconds to allow atrial systole to complete
Heart rate
the number of times the heart beats per minute
Stroke volume
the amount of blood pumped out of the heart per beat
Cardiac output
the amount of blood pumped out the heart per minute
Chemoreceptors
detect changes in levels of CO2 and pH
Proprioceptors
detect changes in movements at the joints
Baroreceptors
detect a change in blood pressure
Parasympathetic nerve
reduces heart rate
Sympathetic nerve
increases heart rate
Venous return
the amount of blood returning to the heart
Muscle pump
contracting muscles squeeze the veins against the bones, forcing blood back to the heart
Respiratory pumpp
the changes in pressure that occur in the thoracic and abdominal cavities during respiration
Pocket valves
found in veins and ensure that blood only flows in one direction
What is the equation to work out cardiac output?
Cardiac Output= stroke volume x heart rate
Resting heart rate for an UNTRAINED performer
70-72 bpm
sub maximal heart rate for an UNTRAINED performer
100-130bpm
resting stroke volume for an UNTRAINED performer
70ml
sub maximal intensity stroke volume for an UNTRAINED performer
100-120ml
maximal intensity stroke volume for an UNTRAINED performer
100-120ml
resting cardiac output for an UNTRAINED perfromer
5 l/min
sub maximal intensity cardiac output for an UNTRAINED performer
10-15 l/min
maximal intensity cardiac output for an UNTRAINED performer
20-30 l/min
resting heart rate for a TRAINED performer
50 bpm
sub maximal intensity heart rate for a TRAINED performer
95-120 bpm
resting strove volume for a TRAINED performer
100 ml
sub maximal intensity heart ate for a TRAINED performer
160-200 ml
maximal intensity heart rate for a TRAINED performer
160-200 ml
resting cardiac output for a TRAINED performer
5 l/min
sub maximal intensity cardiac output for a TRAINED performer
15-20 l/min
maximal intensity cardiac output for a TRAINED performer
