By keeping fit means being physically active I would say your joints and muscles because of the movement,your heart to promote a healthy blood flow to pump you blood and speed up your heart rate to burn calories,and the liver because it helps to rid the body of harmful toxins.
8 or more of the 12 organ systems.
pipe organ
integumentary, muscular, and skeletal systems
Body is not an organ for movement.... body is an assemblage of organ systems.
Skeletal (support) Muscular (motion)
All the organ systems in the body make up an organism.
There are 78 organs in the human body.
The organ systems of the body in alphabetical order are:Cardiovascular/circulatoryDigestiveEndocrineIntegumentaryLymphaticMuscularNervousReproductiveRespiratorySkeletalUrinary
Explain the mechanisms involved in disrupting body systems?
hg
Amphibians use their lungs, and use their thin skin when its moist.
Body systems, organs, tissues, cells