Question

4. The nervous system helps the respiratory system by

A.protecting and supporting the heart
sending message to diaphragm to contract
B.breaking down nutrients needed by lung tissue
C.carrying oxygen to lungs

Answer 1

I think B or C

Hop help:)

Answer 2

The answer is: Sending message to diaphragm to contract.

Why?

Because the nervous system is the only system that can send signals to the other systems. All of the other answers are done by another system