The brain and nervous system

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How does heart rate get controlled during exercise
How does heart rate get controlled during exercise?
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What is increased?
respiration rate
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What is there more CO2 in?
blood
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What is also increased?
Lactate
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What is stimulated in the medulla?
chemoreceptors
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What is in the medulla?
The cardiovascular control centre
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how is this activated?
autonomic nervous system
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Where are impulses from? and what is increased?
medulla and more noradrenaline
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What is increaseD?
SAN increased
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What increases?
heart rate
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What is a nerve impulse?
What is a nerve impulse?
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What is the resting potential of a nerve?
70mV
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What happens when voltage dependent NA+ channels open?
Na+ flow into axon depolarising the membrane
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What then closes?
NA+ channels close
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What opens?
K+ channels open
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What leaves axon? and repolarises the membrne?
K+
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What is hyperpolarised?
membrane, K+ channels close
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What diffuses back into the axon?
recreate the resting potential
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Other cards in this set

Card 2

Front

What is increased?

Back

respiration rate

Card 3

Front

What is there more CO2 in?

Back

Preview of the front of card 3

Card 4

Front

What is also increased?

Back

Preview of the front of card 4

Card 5

Front

What is stimulated in the medulla?

Back

Preview of the front of card 5
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