The Zimbabwe Secondary School Science Project (ZIM-SCI) developed student study guides, corresponding teaching guides, and science kits for a low-cost science course which could be taught during the first 2 years of secondary school without the aid of qualified teachers and conventional laboratories. This ZIM-SCI study guide presents activities and experiments for a unit dealing with the human senses. Anatomy and physiology of the eyes (sight), ears (hearing), tongue (taste), nose (smell), and skin (feel/touch) are investigated. The study of these individual sense organs is then related to the structure and function of the nervous systen. Parts of the brain as well as major nerves are examined during dissection of a rat. The unit concludes with simple experiments designed to establish concepts of reflex action, reflex arc, and voluntary and involuntary actions. Information is provided throughout the unit to help students understand the concepts behind the activities and experiments. (JN)