What is called HMM & LMM in a meromyosin? why?

Question

I have resd diffrent things for that.

in some books, that is acording to molecular weight.

in ncert book that is different.

i want the answer in "Head with hands or Tail"??

Answer 1

1. Myosin filaments are thick and made up of many meromyosins.
2. Each meromyosin has a globular head with short arm called Heavy meromyosin (HMM) and a tail called Light meromyosin (LMM).
3. The head shows active ATPase enzyme and has binding sites for ATP and active sites for actin.