What is a protein that is the main component of the thick filaments in muscle fibers and is responsible for muscle contraction?

What causes the phospholipids to organize themselves the way they do

20 the compound al(nh3)2 has atoms of nitrogen.

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.