Answer :
The lungs and the heart work closely together. The lungs take in air and oxygenate the blood. The heart then pumps the oxygenated blood around tbe body. I hope this helps :)
Musculoskeletal system: Muscular System and Skeletal System
when you flex a muscle it pulls on the bones.
our skeletal system is what keeps us upright and protects vital organs.
the muscles move the bones which allows us to move.
