Control of heart rate (BIOL5) Flashcards by Mary Llamido | Brainscape

Q

How are stimuli detected?

A

Pressure receptors (baroreceptors)

Chemical receptors (chemoreceptors)

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Q

Describe baroreceptors

A

Pressure receptors stimulated by high/low blood pressure

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Q

Describe chemoreceptors

A

Chemical receptors stimulated by O2/CO2/pH level in blood

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Q

Heart’s response to high blood pressure

A

Baroreceptors detect h. blood pressure
Impulses sent to medulla, sends impulses along parasympathetic neurone
Secretes acetylcholine, binds to receptors on SAN
Heart rate slows down

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Q

Heart’s response to low blood pressure

A

Baroreceptors detect low blood pressure
Impulses sent to medulla, sends impulses along sympathetic neurones
Secretes noradrenaline, binds to receptors on SAN
Heart rate inc

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Q

Heart’s response to high O2/low CO2/high pH

A

Chemoreceptors detect chemical changes in blood
Impulses sent to medulla, sense impulses along parasympathetic neurones
Secretes acetylcholine, binds to receptors on SAN
Heart rate dec

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Q

Heart’s response to low O2/high CO2/low pH

A

Chemoreceptors detect chemical change
Impulses sent to medulla, sends impulses along sympathetic neurones
Secretes noradrenaline, binds to receptors on SAN
Heart rate inc.

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