If very loud sound is produced, we immediately cover our ears with hands. What type of response is this?

it is known to be a reflex action called acoustic stapedius reflex or ASR

Explanation:

Loud noise can damage cells and membrane in the cochlea. Listening to loud noise for a long time can over work hair cells in the ear which can cause these cells to die.

Harmful effect might continue even after noise exposure has stopped.

ASR is a reflex in which the stapedius muscle contracts involuntarily within one-tenth of ascend in response to noise...

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