I doubt blood pressure can be accurately registered elsewhere other than from heart level as hydrostatic pressure would cause inaccuracies in the blood pressure reading.
For educative scientific YT channels I'd recommend Veritasium, The Action Lab and NileRed to name a few.
They produce top quality scientific videos about really interesting phenomenas and experiments.
And the best part is they make the concepts simple to understand without the need of a degree or smth lol
What's bad about it? OP has voluntarily turned ads on on ddg (to support ddg I guess).
DDG has been working great for me, so care to enlighten me please?