MUSCLE PHYSIOLOGY

Detailed explanation-1: -Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can’t push them back to the original position. So they work in pairs of flexors and extensors.

Detailed explanation-2: -Because muscle tissue can only contract that is, become shorter and thicker, a muscle can pull but it cannot push. It will return to its original shape when it relaxes but it has no power to push itself back to its relaxed shape.

Detailed explanation-3: -Each skeletal muscle fiber contains filaments of actin and myosin that shorten the muscle and pull on tendons, which in turn pull on bones and move the body. These movements are described as pushes when the muscle moves away from the body or pulls when the muscle moves toward the body.

Detailed explanation-4: -Antagonistic muscles Muscles can only contract and relax. This means for skeletal muscles, they can only pull on bones. They cannot push them back. This would mean that if your joints were moved by one muscle, then you would be able to move them once and not return them to their original position.

Detailed explanation-5: -Muscles can pull on bones, but they can’t push them back to their original position, so the muscles work in pairs of flexors and extensors. The extensor muscle relaxes and stretches as the flexor muscle contracts to bend the joint.