1. Muscles function in of the head, neck, and limbs, as well as propulsion of the contents through the digestive tract.2. Muscles function in by preventing unwanted movement, as in maintaining posture. 3. Using , or valves, muscles control the passage of contents from one body cavity or lumen to another. 4. Since muscle contraction requires energy to do work, movement muscles help maintain our body . 5. By absorbing a large share of one's , muscles play an important role in blood sugar control.

1. Muscles function in movement of the head, neck, and limbs, as well as propulsion of the contents through the digestive tract.

2. Muscles function in stability by preventing unwanted movement, as in maintaining posture.

3. Using sphincters, or valves, muscles control the passage of contents from one body cavity or lumen to another.

4. Since muscle contraction requires energy to do work, movement muscles help maintain our body heat.

5. By absorbing a large share of one's glucose, muscles play an important role in blood sugar control.

Explanation:

Muscles have different functions in the body. They allow our head, neck and limbs to move, and also have an important role in the propulsion of contents through the digestive track.

Muscles are soft tissues that also have a role in stability by maintaining posture and help the passage of contents from different cavities by using sphincters.

Their main source of energy is glucose in the body. By using this energy, muscles help to maintain our bodies temperature and blood sugar control.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.