IB Biology Cardiac Cycle

IB Biology Cardiac Cycle

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Storyboard Text

  • Sir, I've been wondering what myogenic contraction is. I learnt it in Biology but I didn't really understand it.
  • Sure kiddo. Your heart is myogenic, meaning it can contract without stimulation from motor neurons. The membrane of a heart muscle cell depolarises when the cell contracts and this activates adjacent cells, so they also contract.
  • Oh! But how does the heart maintain my blood pressure?
  • Well, your blood pressure gradient can be maintained by generating high hydrostatic pressure to pump blood out of the heart, while also creating low pressure to bring it back in.
  • Oh hi Daisy. Mr Humbert was just explaining something to me about the heart.
  • Ah! Anyways, Mr Flaubert wants to see you about your Biology test. You should go find him in the lab soon.
  • Saitama! I've been looking for you! What are you doing here?
  • One Eternity Later...
  • There you are! I've been looking everywhere for you! I need to talk to you about your test. Have a seat.
  • Thousands of tears later...
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