Twenty-four units on health service careers are presented in this teacher's guide. The units are organized into four sections as follow: Section A--Orientation (health careers, career success, Health Occupations Students of America); Section B--Health and First Aid (personal health, community health, and first aid); Section C--Body Structure and Function and Applied Skills (microbiology, basic concepts of physical sciences, endocrine system, genitourinary system, respiratory system, musculoskeletal system, nervous system, digestive system, and circulatory system); and Section D--Basic Health Assistant Skills (nutrition, patient cleanliness, patient environment and bedmaking, body mechanics and positions, vital signs, medical asepsis, surgical asepsis, isolation technique, and observation and recording). Each instructional unit generally contains eight components: performance objectives; an outline of minimum instructor and student activities to accomplish unit objectives; information sheets presenting basic unit content; transparency masters; job sheets which outline skills to be achieved; student assignment sheets related to the unit information sheets (answer keys are provided); and objective tests with answer keys. (JH)