Regulating Heart Rate- Nerves and Hormones (4.1.2)

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What does the blood supply the tissues with?
Glucose, oxygen, amino acids and fatty acids
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What is taken away from cells in the blood?
Carbon dioxide and urea.
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What does the heart's pacemaker do?
It initiates the spread of electrical impulses to the AVN and purkyne tissue.
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What does myogenic mean?
Muscle tissue can initiate its own contractions.
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What is a pacemaker?
Region of tissue in the right atrium wall that can generate an impulse.
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What is the cardiovascular centre?
Specific region of the medulla oblongata that monitors levels of physical activity, blood CO2 conc. and blood pressure.
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Describe how exercise affects heart rate.
Increased activity-higher cell resp. rate. More co2 produced-lowers plasma pH. Detected by chemoreceptors. Nerve impulses sent to CV centre. Increased freq. of n.i sent along accelerator nerve to SAN. SAN sends more frequent electrical excitation.
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Describe how adrenaline affects heart rate.
Has direct effect on cardiac muscle tissue and increases heart rate for fight or flight response.
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Describe how reduced activity affects heart rate.
Opposite to exercise, but using vagus nerve.
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Describe how raised blood pressure affects heart rate.
Detected by pressure receptors in corotid arteries. Nerve impulses to CV centre, then along vagus nerve to SAN.
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Describe how limb movement affects heart rate.
Triggers stretch receptors in muscles. Nerve impulses to CV centre. Increased frequency of nerve impulses sent along accelerator nerve to SAN.
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Card 2

Front

What is taken away from cells in the blood?

Back

Carbon dioxide and urea.

Card 3

Front

What does the heart's pacemaker do?

Back

Preview of the front of card 3

Card 4

Front

What does myogenic mean?

Back

Preview of the front of card 4

Card 5

Front

What is a pacemaker?

Back

Preview of the front of card 5
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