Control of heart rate: Role of SAN & AVN in the cardiac cycle, Parasympathetic & sympathetic nerves

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3 жыл бұрын

Learn how the SAN controls the cardiac cycle, and the role of the AVN, Bundle of His and Purkyne fibres.
learn how the rate at which the SAN releases waves of depolarisation is coordinated by the medulla oblongata and the role of the sympathetic and parasympathetic nerves.
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Пікірлер: 46

@blythehenderson 28 күн бұрын

cramming for the paper at 9am. so simple, so streamlined. your videos are a godsend. thank you!!!

@daisywells6608 3 жыл бұрын

This channel has helped me so much, its been a lifesaver! Thank you for all of the videos you have released and the time you have spent to create them. You make the content much easier to understand and much more accessible. Youre saving my revision! Thank you :)

@MissEstruchBiology 3 жыл бұрын

Aww thank you for such a lovely message Daisy, it makes me so happy to know how much its helped you 😊 Fingers crossed for the rest of your revision and exams and really hope you achieve the grades you're aiming for.

@katietaylor2804 3 жыл бұрын

The most helpful channel❤️ I’m so glad I’ve discovered you. you are helping us more than you know

@MissEstruchBiology 3 жыл бұрын

I'm so glad the channel is helping you Katie😊😊

@marionmay7731 3 жыл бұрын

Best A- Level Biology videos.

@MissEstruchBiology 3 жыл бұрын

Aww thank you!! Glad you think so.

@heba1328 3 жыл бұрын

Thank you! You explained it very well.

@MissEstruchBiology 3 жыл бұрын

Glad it was helpful! :D

@bhekiebhekie9616 2 жыл бұрын

THANKS FOR SUCH AMAZING EXPLANATIONS

@MissEstruchBiology 2 жыл бұрын

So happy you think so! Hope it had helped 😊

@mennaahmed4501 3 жыл бұрын

You are amazing ! Thank you so much for your effort god bless you ❤️

@MissEstruchBiology 3 жыл бұрын

Thank you ☺ So happy to hear you like the content

@mariaandthebear 3 жыл бұрын

Thank you! This was very helpful :--)

@MissEstruchBiology 3 жыл бұрын

Really glad it helped 😊

@patienceomosigho 5 ай бұрын

Medulla oblagata - controls how quickly the wave of depolarisation is released from the SAN SAN - a tissue that releases waves of depolarisation that cause the atria to contract acts as a pacemaker Any impulses sent via the parasympathetic nervous system will trigger the SAN to slow down the release of waves of depolarisation,decreasing the heart rate.

@arinamohajeri9256 3 жыл бұрын

thank you it was so good

@MissEstruchBiology 3 жыл бұрын

you're welcome 😊☺

@GastricIssuesFartman Жыл бұрын

Hi Miss, the textbook mentions the binding of acetylcoline which binds to receptors on the SAN. Is mentioning this unnecessary?

@salemabrahaley2774 Ай бұрын

i dont even do aqa but these vids are too good🤣

@samsephton5788 2 жыл бұрын

Another great video!! Just clarifying if the electrical impulses in the flow diagrams are still Waves Of Depolarisation?

@samsephton5788 2 жыл бұрын

And if so are they interchangeable? Thanks in advance!!

@aizazeeshan9728 8 ай бұрын

depolarisation happens in tissues?

@user-uf2iq2qg5y 4 ай бұрын

Thank you so much Ms Estruch for your videos and notes they’ve helped me so much!🫶🏽

@MissEstruchBiology 4 ай бұрын

So pleased they have helped you 😀

@sunphlower3080 Жыл бұрын

How does heart rate affect blood pressure?

@sabriya5219 3 ай бұрын

Hi, in the CGP textbook it mentions acetylcholine and noradrenaline binding to receptors on the SAN. Is this necessary info for AQA?

@shira7658 28 күн бұрын

Don’t need to know it

@kamil_z91_72 2 жыл бұрын

been looking at the specification and aqa approved workbooks and i cannot find anything on it so do i have to learn it?

@MissEstruchBiology 2 жыл бұрын

its in topic 6 AQA

@harrybellis Жыл бұрын

at the end in the part where receptors can change heart rate, you used pressurereceptors in some of the slides and chemoreceptors in others. Are these words interchangeable? Love these playlists by the way they have got me an A in my mock so far!

@MissEstruchBiology Жыл бұрын

Hey, they aren't interchangeable, but they are both receptors in this process. Chemoreceptors detect changes on pH (H+ ions) where as pressure receptors detect changes in blood pressure

@AM-hn7gj 2 жыл бұрын

How does the left atrium contract at the same time as the right atrium if the SAN is only located in the right atrium?

@arooj7329 Жыл бұрын

because the wave of electrical activity spreads across both atria

@talyastewart426 Жыл бұрын

How does noradrenaline play into this?

@ash.orsmash 4 ай бұрын

pretty sure noradrenaline is a neurotransmitter that is released from the adrenal glands and travels through the sympathetic nerve in order to increase your heart rate

@Ika-zg7vz 2 ай бұрын

Do u do OCR? If so, then for low bp/pH levels its the sympathetic ns so impulse travels from medulla to SAN (via sympathetic/accelerator nerve which releases noradrenaline which binds to SAN) to increase heart rate

@ordinarykaycee 11 ай бұрын

Just the apex

@alanszewerniak2958 4 ай бұрын

is this a level?

@MissEstruchBiology 4 ай бұрын

yes 😊

@anaymorjaria6447 7 ай бұрын

what about if it were an increased PH?

@aqsakhan6946 2 ай бұрын

Increased ph means more co2 in blood so pressure is increased to remove the co2 from blood so you talk about chemoreceptors detecting the change in ph which sends impulses the medulla oblongata which sends even further impulses via the sympathetic pathway to the SAN to increase the heart rate

@Ika-zg7vz 2 ай бұрын

@@aqsakhan6946 Almost correct! If high pH - LOW CO2, so same process just heart rate must now decreases so impulse travels down the Vagus nerve (paraympathetic ns) to SAN x

@aqsakhan6946 2 ай бұрын

@@Ika-zg7vzoh yeh sorry confused high ph for low ph thanks