Given a scientific question, generate an incorrect answer to the given question. The incorrect answer should be a plausible alternative to the correct answer. The answer should be some other item belonging to the same category as the correct answer but should be incorrect.
--------
Question: What are in leaves that function as solar collectors and food factories?

Answer: cellulose

Question: What is the air that remains after a forced exhalation called?

Answer: kinetic volume

Question: Along with nerve tissue, what kind of tissue are lecithins and cephalins important constituents of?

Answer:
heart tissue