Answer:B) Rough endoplasmic reticulum
Explanation:
Answer: proteins
Explanation:
The myofibril proteins are organized into filaments of varying sizes thick and thin and is called myofilaments.
<span>Endocytosis is a process for moving items that are outside of the cell into the cytoplasm of the cell. Exocytosis is a process for moving items from the cytoplasm of the cell to the outside.</span>