Which combination of muscles contractin causes inspiration ?

Explain why: Contraction of inspiratory muscles causes inspiration while their relaxation causes expiration.

Give reason for the following: Contraction of inspiratory muscles causes inspiration while their relaxation causes expiration.

Contraction of muscle is caused by

Contraction of a muscle is caused by

Contraction of a muscle is caused by

Which respiratory muscles are used in inspiration?

Which respiratory muscles are used in inspiration.