Final answer:
The principles of body mechanics include using the body's weight for pushing or pulling, pivoting the entire body to avoid twisting and bending from the hips and knees when lifting. Good posture maintains this alignment of the center of gravity, preventing excess muscle strain and back injury. The correct option for the question is (c) all of the above.
Step-by-step explanation:
The question revolves around the basic rules of body mechanics and it is critical to understand these to prevent injury and maintain proper body function. These rules suggest that one should:
- Use the body's weight to push or pull heavy objects, leveraging your weight rather than your muscle power alone.
- Pivot the entire body to avoid twisting, which can put undue stress on the spine and lead to injury.
- Always bend from the hips and knees to keep the spine straight and to employ the powerful muscles of the legs when lifting objects.
Maintaining good posture by aligning the center of gravity over the hips helps to prevent the necessity for excess muscle exertion to balance the body. Moreover, reducing the exertion of back muscles minimizes the risk of back strain and potential disk damage. When lifting items, it is crucial to keep the back erect while using the strength of leg muscles to minimize spine issues.
Considering the principles of body mechanics and the application of these principles in real-life scenarios, the correct option for the question is (c) all of the above.