Which factor is the most important in performing the activities of daily living?
muscular endurance
muscular strength
muscular size
number of muscle fibers

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.

To avoid whiplash, the center of the headrest must be your ears.

Brian said that when you get your body broken such as a arm or leg. it means your bones break to pieces and must do surgery or get a cast to fix it.is it true or false?