Eventually all body systems will see the effects of dangerous gases, but the most immediate effects will be seen by the respiratory systems and the circulatory systems.
Every body system is affected by every other body system.
The brain
The body systems that are affected by muscular dystrophy include the nervous system and the musculoskeletal system. Many organs are also affected by this genetic disorder.
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the skeletal system
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the other systems are not affected
It is part of the urinary tract.
Just about anything can be dangerous if in very large amounts or used for the wrong thing. In these cases, they are not dangerous if they are normal. Body fluids can (sometimes) contain viruses and bacteria which can be spred and therefore dangerous. Body gases can cause discomfort but other than that, they pose no danger.
Cardiovascular system
Muscular and Skeletal systems.
We study the body systems of worms so that we learn how to eliminate those that are dangerous and cause diseases to humans.