Muscle tissue is made up of specialized muscle cells. How are individual muscle cells different from the muscle tissue in the biceps muscle?
OA Muscle cells can contract and change shape, but muscle tissue cannot.
OB. Muscle cells are flexible, but muscle tissue is rigid.
OC. Muscle cells have a complex structure, but muscle tissue has a simple structure.
OD
Muscle cells are smaller than muscle tissue.

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.