[TEA-Async_24-25] SB ...

Videos: 

Circulatory System Intro

https://www.youtube.com/watch?v=73ei6YD0VnM

Heart and circulatory system

https://www.youtube.com/watch?v=CWFyxn0qDEU

(Start the below video from 2:30')

https://www.youtube.com/watch?v=QhiVnFvshZg

Phases of the cardiac cycle

https://www.youtube.com/watch?v=IS9TD9fHFv0