Pick one of the five components of physical fitness define the component. describe an exercise which can measure your component. remember your answer should be at least 3-4 correctly structured sentences.

In multiple sclerosis, the immune system destroys the substance that coats and protects nerve fibers in the brain and spinal cord. this causes inflammation and injury to the nerves, and the axons don't conduct impulses as well.

And the 1 points are for this 20 if i get all 3 of them correctly i will give you brainliest and if you only get all 3 i will give you brainliest including a and the rating will be 5 and if you get those i will give you 20 points

The pleural cavity contains the a brain heart lungs spine