Structure Of The Cell Membrane: Active and Passive Transport

What is it that separates what's inside a cell from what's outside of a cell? Why, that's the cell membrane. What's it made out of? How does it work? How do molecules get in and out of the cell? These are super-important concepts! Let's take a look.
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Can you please explain cotransport in the involvement of the proton pump?

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Question, doesnt the cholesteral give the cell membrane fluidity not rigidity ?

[@ProfessorDaveExplains]

no the molecule itself is rigid because of the ring system, without cholesterol the membrane would be too fluid to maintain structural integrity

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