Back to School Week - Saturday: Biology!

And here is the example for the Saturday - Biology!
I'm under your face,
I'm outside your mind;
A biological case,
Pressure brings pain sometimes.
What am I?
Event description and rules
Thread will close Sunday, 13th of September, 17h59 server time.
This post has been edited 2 times, last edit by "Sequana" (Sep 21st 2020, 5:27pm)
cytoplasmI'm thick and jelly, I fill up every cell. I protect all that's inside, including organelles. What am I?
correctcytoplasmI'm thick and jelly, I fill up every cell. I protect all that's inside, including organelles. What am I?
It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.

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