Hormonal and nervous control of heart rate Flashcards

1
Q

SAN

A

initiates contractions

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2
Q

Rate of SAN contractions is controlled by…

A

…-hormones acting directly on SAN
-messages from autonomic nervous system

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3
Q

2 centres in medulla oblongata

A

cardiacceleratory centre and cardioinhibitory centre

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4
Q

each centre is linked by a

A

motor neurone to the sino-atrial node

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5
Q

Accelerator nerve

A

Sympathetic system

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6
Q

Vagus nerve

A

Parasympathetic system

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7
Q

Accelerator nerve what it does

A

-accelerates HR
-increases force of contractions

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8
Q

Vagus nerve what it does

A

-reduces HR

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9
Q

Chemoreceptors

A

-CO2/O2/pH
-located in aortic and carotid bodies, medulla
-detect changes in level of particular chemicals in blood

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10
Q

Baroreceptors

A

-pressure (mechanoreceptors)
-located in aortic arch and carotid sinus
-detect changes in blood pressure

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11
Q
A
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