Answer:
The NT doesn't compare the local church (the church you go to) with a body. But it does compare the universal church (all believers in Christ) to a body.
The universal church is like a body because it is made up of many parts (believers).
These parts should function in harmony together - just as the many parts of a body function together.
No part is more important than another part. Every part has a function.
Just as a head leads/controls a body, Christ is the head of the universal church.
Comment: Just what do you mean by universal as a mainstream church carries this as part of its name? The Bible calls the Church Jesus established, 'the Church of God,' in about 12 places in the N.T.. Is this your 'universal' Church?? This Church, by the way, has always had the 'little flock.'