Why is it important for health care worker to understand body mechanics and ergonomics

Its for an HSC0003 class please make it sound good thank you.Type a brief essay on Body Mechanics and Ergonomics include the following: 1) Define Body Mechanics and Ergonomics. 2) Why is it important for health care worker to understand body mechanics and ergonomics 3) The most common injuries suffered by health care professionals. 4) Ways to prevent injury to the musculoskeletal and nervous system. 5) Proper posture that you should maintained while: a) walking, b) standing, c) sitting, d) lifting light objects, e) lifting heavy objects and f) lifting patients. 6) Proper positioning for working at the computer, and 7) Ways to avoid eyes strain while using the computer.