I'm fairly sure it would be windward and leeward. So C
here are the structures i hope it helps
Answer:
primary, secondary, tertiary, and quaternary.
It is sub-classified as a rough, or granular ER, and a smooth or agranular ER. The rough Endoplasmic reticulum is lined with ribosomes and modifies and packages proteins that have been produced by the ribosome. In skeletal and cardiac muscle it is known as the sarcoplasmic reticulum.