1. what does the neurotransmitter bind to on the sarcolemma? 2. The binding of Ach to receptor causes what to open

3. When the Na+ gates open what floods out of the muscle fiber?

4. The movement of Na+ out of the muscle causes a what of the sarcolemma?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.