Build the body-systems vocab off
器官 (qìguān, organ):
感觉器官 (sense organs),
消化器官 (xiāohuà qìguān, digestive organs),
呼吸器官 (hūxī qìguān, respiratory organs),
生殖器官 (shēngzhí qìguān, reproductive organs). Same X+
器官 frame works for all body systems in textbook biology.