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- เผยแพร่เมื่อ 7 ก.ย. 2024
- Cardiac muscles are myogenic, meaning that their rate of contraction (ie. heart rate) is controlled by the sino-atrial node itself. However, the medulla oblongata of the brain can affect the frequency of its impulses to affect the heart rate under different scenarios. The adrenal medulla can also release adrenaline and noradrenaline that can affect the heart rate. In this video, we will focus on the nervous pathway of how changes in the blood can be detected and to signal a change in heart rate.
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I forgot to thank you after completing my Biology A Level. I got an A* in the end, just from your videos, you’ve been incredibly useful and I’m sure that many students appreciate all the hard work you dedicate. Thank you ever so much.
Aww thank you for your kind words!! It means a lot :) and well done on achieving your A* and all the best in your next adventure!
How else did you revise?
@@Heyhihi-cf6ck flashcards and past papers :)
best A level Biology channel on TH-cam
Hey @biorach I just want to say thank you so much. I completed my last exam for a-level biology yesterday and wouldn't have felt so confident if it weren't for your videos. These past two years have been really difficult to have had to learn so much at home but you really helped! You definitely deserve much more credit for the time and effort you've put into making an engaging and informative video for every chapter, you're a life saver! Thank you :)
I'm really glad to hear that the videos have helped you! So pleased that you feel more confident about the content too. Thank you for the support and all the best with what comes next! :D
I'm on my gap year and have been watching your videos Biorach girl throughout and honestly I love them because it keeps me remembering and learning which I really enjoy
Hey, thank you so much for this
Hi love your videos I've always struggled with biology but your videos have been really helping me! was wondering when are you going to release ch16 videos?
On my list of topics to cover! :)
really love your videos, they're so well explained, thank you sm!! Could you please cover C16 next?
Will do! I have it planned but just haven't had the time to film it...! :)
Do you cover the whole OCR A biology specification ?
amazing video
I was curious if you could make an exam technique video explaining how to get the marks. I feel like ik the content but just dont know how to answer. Only if its worth your time :)
@L Drago thanks
Hello. Appreciate those videos and the way you take out your precious time for this :)
Just wanted to ask you, are all of these A2 biology videos still valid with the current 2019-2021 syllabus? Thanks 😊
Yes they are! :)
@@BioRach thanks a lot. Also what does 'OCR' mean in your video titlesm
OCR is the exam board.
hi! is it possible for you to do a video covering mitosis? love your videos by the way there really help me get through A level bio
shes got a playlist that covers this. Its ch6 - cell division
I'm hoping to cover the whole spec eventually so yes mitosis is on my list! For now there's the playlist on Ch.6 that covers meiosis and cell cycle so watch them and see if they help for now :)
can you do a video on the spirometer please?
hey this sub-topic is not mentioned in the OCR spec- do u still think its worth going over?
it’s in the spec just under plant and animal responses !
First