Biology- Heart rate and adrenaline

Questions about the heart rate and how it changes.

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Why do muscles need oxygen during excercise?
They respire aerobically and need the oxygen to release energy.
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What does aerobic respiration in humans also produce?
Carbon dioxide.
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Carbon dioxide levels are picked up by what?
Receptors in the aorta and carotid artery.
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Where do these receptors send signals to?
The brain.
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Why does heart rate increase?
To carry the blood to the lungs quickly to get rid of the dangerous carbon dioxide.
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Why does the oxygen supply to the muscles need to increase when you are threatened?
The muscles need to prepare for a "fight or flight" motion.
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Adrenaline is released from where?
The adrenal glands.
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Adrenaline binds to specific receptors in the heart and causes what?
The heart to contract faster to speed up the blood supply to different muscles.
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Other cards in this set

Card 2

Front

What does aerobic respiration in humans also produce?

Back

Carbon dioxide.

Card 3

Front

Carbon dioxide levels are picked up by what?

Back

Preview of the front of card 3

Card 4

Front

Where do these receptors send signals to?

Back

Preview of the front of card 4

Card 5

Front

Why does heart rate increase?

Back

Preview of the front of card 5
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