Answer:
1. The phrase "cells in the muscles" refers to muscle fibers. Muscle fibers are the individual cells that make up the muscles in our body. They are responsible for generating force and enabling movement.
2. The phrase "removed by the blood" refers to lactic acid. Lactic acid is a waste product that is produced by the muscles during intense exercise. It is carried away from the muscles by the bloodstream and eliminated from the body.
3. The phrase "improves the health of the muscles" refers to stretching. Stretching is a form of exercise that involves gently elongating the muscles and tendons. It helps to increase flexibility, improve circulation, and maintain the health of the muscles.
4. The phrase "how far a body part can move in any direction" refers to range of motion. Range of motion refers to the extent to which a joint can move freely in different directions. It is important for maintaining mobility and preventing stiffness or injuries.
5. The phrase "can be damaged during exercise" refers to myofibrils. Myofibrils are the contractile units within muscle fibers. They can experience microscopic damage during intense exercise, which is a normal part of the muscle repair and growth process.
6. The phrase "injury and shortening of the myofibrils" refers to scarring. Scarring occurs when the myofibrils in the muscle fibers are damaged and subsequently repaired. This can lead to the formation of scar tissue, which may affect the elasticity and function of the muscle.
Step-by-step explanation: