Question

1. summarize the above article in your own words in three to five sentences. pick only the most important details.
2. what organs or system does the skeletal system protect?
3. what organs or system does the skeletal system most interact with? how?
4. describe the structure of a bone.
5. what is the role of osteoblasts?
6. why does the body need calcium and phosphorus?
7. explain how bone density is affected by age.
8. what is osteoporosis? what causes it?
9. what can be done to prevent osteoporosis?
10. think about your lifestyle. does it include weight - bearing activities to promote bone density? if yes, give examples. if no, give two examples of activities you could participate in to promote bone density.

Explanation:

1. Summarize an article by picking key details in 3 - 5 sentences.
2. The skeletal system protects organs like the brain (skull), heart and lungs (rib - cage).
3. It most interacts with the muscular system. Muscles attach to bones via tendons, and their contractions move bones.
4. A bone has an outer hard layer (compact bone), a spongy inner layer (cancellous bone), and a central cavity (marrow cavity).
5. Osteoblasts are cells that build new bone tissue by depositing calcium and other minerals.
6. Calcium and phosphorus are needed for bone strength as they are major components of bone mineral matrix. Also, calcium is important for muscle contraction and nerve function.
7. Bone density increases during growth and development, peaks in early adulthood, and then gradually decreases with age due to reduced bone - building activity and increased bone - resorption.
8. Osteoporosis is a condition where bones become weak and brittle, increasing the risk of fractures. Causes include aging, low hormone levels (e.g., estrogen in women), poor diet, and lack of physical activity.
9. Prevention of osteoporosis includes a diet rich in calcium and vitamin D, regular weight - bearing exercise, and avoiding smoking and excessive alcohol.
10. Weight - bearing activities to promote bone density include walking and dancing.

Answer:

1. Summarize the article in 3 - 5 sentences with key details.
2. Brain (skull), heart and lungs (rib - cage).
3. Muscular system; muscles attach to bones via tendons and move them.
4. Outer compact bone, inner cancellous bone, marrow cavity.
5. Build new bone tissue by depositing minerals.
6. For bone strength, muscle contraction, and nerve function.
7. Increases during growth, peaks in early adulthood, then decreases with age.
8. Weak and brittle bones; aging, low hormone levels, poor diet, lack of activity.
9. Calcium - rich diet, vitamin D, regular weight - bearing exercise, avoid smoking and excessive alcohol.
10. Walking, dancing.