what is the resting heart rate of a typical adult human
70 beats per minute
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why does the heat rate need to be able to be altered
to meet varying demands for oxygen
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what part of the brain controlls heart rate
medulla oblongata
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how many centres does the medulla oblongata have
two
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what are the two centers in the medulla oblongata
1) a center that increases heart rate, linked to the san by the sympathetic nervous system. 2)a center that decreases heart rate, linked to the san by the parasympathetic nervous system
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what detiremines which center within the medulla oblongata is stimulated
the information they recieve from the two types of receptor
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what do the two receptors respond too in the medulla longata
chemical changes in the blood and pressure changes in the blood
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where are chemoreceptors found
in the wall of the carotid arteries (the arteries that serve the brain)
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what are chemoreceptors sensitive too
changes in ph of the blood caused by by changes in co2 concentration
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what does co2 form in solution... therefore lowering ph
an acid
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where do the pressure receptors occur
within the walls of the caroarteries and the aorta
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Other cards in this set
Card 2
Front
why does the heat rate need to be able to be altered
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