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