Question

1. which type of muscle fiber helps you hold a plank for 1 minute? part 4: application and short answer 20. give one example of when all three muscle types (skeletal, smooth, and cardiac) are active at the same time. 21. describe one activity that uses mostly fast - twitch fibers. 22. explain how muscles help protect your internal organs. 23. why do your muscles get sore after exercise? 24. what happens when a muscle is not used for a long time? 25. name one muscle disorder or injury and describe its effect. 26. how does exercise keep muscles healthy and strong? 27. which type of muscle contraction happens when landing from a jump? 28. true or false: fast - twitch fibers rely heavily on oxygen for energy. 29. which muscle type is responsible for moving food through the digestive system? 30. why is learning about muscle contractions important for

Explanation:

1. Holding a plank for 1 minute requires endurance, which is a characteristic of slow - twitch muscle fibers.
2. During physical activity like running, skeletal muscles move the body, smooth muscles in the digestive system work to process food, and cardiac muscle pumps blood.
3. Sprinting is an activity that uses mostly fast - twitch fibers as it requires quick, powerful bursts of energy.
4. Muscles, especially the abdominal muscles, act as a protective layer around internal organs, cushioning them from external impacts.
5. Muscles get sore after exercise due to microscopic damage to muscle fibers and the body's inflammatory response to repair them.
6. When a muscle is not used for a long time, it undergoes atrophy, losing strength and size.
7. One muscle disorder is muscular dystrophy, which causes progressive muscle weakness and loss of muscle mass over time.
8. Exercise keeps muscles healthy and strong by stimulating muscle protein synthesis, increasing blood flow to muscles, and improving muscle endurance and strength.
9. When landing from a jump, an eccentric muscle contraction occurs as the muscle lengthens while under tension to control the movement.
10. False. Fast - twitch fibers rely more on anaerobic energy sources rather than oxygen for energy.
11. Smooth muscle is responsible for moving food through the digestive system through peristalsis.
12. Learning about muscle contractions is important for understanding movement, preventing injuries, and improving athletic performance.

Answer:

1. Slow - twitch muscle fibers
2. Running
3. Sprinting
4. Muscles act as a protective layer
5. Microscopic damage and inflammatory response
6. Atrophy
7. Muscular dystrophy; progressive muscle weakness and loss of mass
8. Stimulates protein synthesis, increases blood flow, etc.
9. Eccentric muscle contraction
10. False
11. Smooth muscle
12. For understanding movement, injury prevention, etc.