The answer would be the hardening of the myelin sheath. Multiple sclerosis is a chronic and inflammatory disease affecting the Central Nervous System and can cause a lot of symptoms like sensation changes, visual problems, severe fatigue and muscle weakness.
Answer:a
Explanation:the rough endoplasmic reticulum is a cell organelle that has ribobomes attached to it.the ribobomes attached gives it a coarse appearance. Rough endoplasmic reticulum is involved in the production of protein to be transported out of the cell.
The ribosomes pack amino acid into the proteins and then passes it to the rough endoplasmic reticulum.from there it is pass to the cis end of the Golgi apparatus.in the Golgi apparatus,further modifications takes place and the proteins is transported out of the cell.
Free ribobomes synthesize proteins meant for the cytosol.
The smooth endoplasmic reticulum synthesis non-protein molecules such as steroids and lipids.
Well, it's obvious, because without a transport system, cells wouldn't have the nutrients and things they needed!! And waste wouldn't be able to circulate out of cells.