Plasma cells are activated b cells that secrete antibodies.
Antibodies are protein molecules.
Plasma cells are activated b cells that secrete protein molecules.
Plasma cells are activated B cells that secrete what?

1: heat or cold
2: harmful substances
3: Leptospirosis
4: bioaerosols
5: protein molecules
6: Chemical energy
7: major threat to health
8: Veins and arteries.