When you cover your ear, where does the sound come from?

Question

go to a quiet place, cover your ear with your hand, you will hear a high pitched sound, something like 'yiiiiiiiiiiiiiiiiiiiiiiiiii'.... where does it come from?and what is it?

Answer 1

the sound is due to blood circulation in and around the ear ..

Answer 2

I'm pretty sure it's not an actual sound. I think it's the brain's response the the lack of sound over time, although I have no idea how it actually works.

If somebody knows anything about how it works, I would also be very interested to learn about it.

Answer 3

i think that i comes from your body systems.