Controlling the Heart Rate

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What nervous system is the heart rate controlled by
The autonomic nervous system
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Which part of the brain is responsible for controlling the heart rate and making any adjustments?
The medulla oblongata
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How many centres are there in the medulla oblongata and what do they do?
2, one increases heart rate and one decreases heart rate =
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How does one of the centres increase heart rate?
By sending impulses through the sympathetic nervous system, via the accelerator nerve
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How does one of the centres decrease heart rate?
By sending impulses through the parasympathetic nervous system, via the vagus nerve
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What are the 2 types of receptors that provide information for the medulla oblongata
Chemoreceptors and Baroreceptors
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Chemoreceptors
Detect changes in pH of blood, eg high levels of CO2 reacts with water in blood forming carbonic acid, lowers pH, heart rate increased (lowers CO2 levels), when pH rises, receptors detect this and slows rate to normal again
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Baroreceptors
Detect change in pressure, if blood pressure too high, the heart rate will decrease reducing blood pressure, when
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Hormonal control of the heart
The heart rate can also be effected by hormones, for example adrenaline and noradrenaline, these affect the pacemaker region, increasing frequency of the impulses produced by the SAN
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Other cards in this set

Card 2

Front

Which part of the brain is responsible for controlling the heart rate and making any adjustments?

Back

The medulla oblongata

Card 3

Front

How many centres are there in the medulla oblongata and what do they do?

Back

Preview of the front of card 3

Card 4

Front

How does one of the centres increase heart rate?

Back

Preview of the front of card 4

Card 5

Front

How does one of the centres decrease heart rate?

Back

Preview of the front of card 5
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