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Physiology 1

heart and lung function

TermDefinition
respiratory centre area in the brain stem that controls breathing rate and depth
pulmonary circulation blood from the heart to the lungs and back to the heart with oxygen
system circulation oxygenated blood carried from the heart to body tissues and back to the heart.
vasoconstriction reducing flow of blood into capillaries
vasodilation increasing flow of blood into capillaries
systolic pressure pressure of heart contracting
diastolic pressure pressure of the relaxed heart
venous return mechanisms that assist the return of blood to the heart.
skeletal muscle pump muscle action squeezes veins and forces blood towards the heart
respiratory pump breathing movements force blood to flow towards the heart
arterio-venous oxygen difference amount of oxygen removed from the blood by the muscles
SAN (sino-arterio node) small mass of cardiac muscle that generates the heartbeat
intrinsic the idea that the heart generates it's own contraction from within itself
myogenic impulses generated without nervous stimulation
AVN (atrio-ventricular node) bundle of tissue that forms part of the conduction system
bundle of His specialised bundle of nerve tissue that forms part of the conduction system
purkinje fibres specialist nerve fibres found in the ventricles
stroke volume Volume of blood leaving the left ventricle per beat
ejection fraction proportion of blood in left ventricle pumped out each beat
cardiac output Stroke volume x heart rate
Starling's law of the heart the greater the venous return, the greater the strength of contraction
chemoreceptors group of cells sensitive to changes in blood acidity
hypertrophy (athletes heart) the increase in size of the heart that accompanies training
bradycardia the reduction in resting heart rate that accompanies training
Created by: ChrisWalsh
 

 



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