The major components are skin (cutaneous membrane), hairs, nails and exocrine glans... formal meaning: the dermis, epidermis and the accessory structures.
Hair and the Nails
The heart which pumps the blood and the arteries and veins that carry the blood around
The Major Components of Rotary Engines
How a Diesel Fuel Injection System Works
How to Change Major Components in Your PC
Four Stroke Cycle Car Engine