This is another question I need help with plz

The endoplasmic reticulum, Golgi apparatus, and lysosomes are thus distinguished from other cytoplasmic organelles by their common involvement in protein processing and connection by vesicular transport.

endoplasmic reticulum (ER) (DEFINITION) Organelle in eukaryotic cells that helps make and transport proteins; site of lipid synthesis.

Golgi apparatus (DEFINITION) Organelle in eukaryotic cells that processes proteins and prepares them for use both inside and outside the cell.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.