Anatomy and physiology — skeletal, muscular, circulatory and respiratory systems

Anatomy studies body structure; physiology studies body function. For a Physical Training Instructor, both are practical sciences because exercise changes posture, movement, heart rate, breathing, temperature and fatigue. The body is commonly studied through levels of organisation: cell, tissue, organ, system and organism. Four basic tissues are high-yield for objective questions: epithelial tissue covers surfaces and lines cavities; connective tissue supports and binds; muscle tissue produces movement; nervous tissue conducts impulses.

Physical activity depends on coordinated work by many systems, but the skeletal, muscular, circulatory and respiratory systems form the core performance chain. Bones provide levers, muscles pull on them, blood supplies oxygen and nutrients, and lungs exchange gases. Homeostasis means maintaining a stable internal environment despite external change; during exercise, heart rate, breathing rate, sweating and blood flow adjust to keep oxygen delivery and heat balance within workable limits.

For PTI exams, avoid treating these systems as isolated lists. A sprint, kabaddi raid or kho-kho chase is a combined event: joints permit movement, muscles generate force, the heart raises cardiac output, and lungs increase ventilation.

Exam focus: learn structure with function, because most MCQs test why a part matters in movement or training.