Class 6 Exam > Class 6 Videos > Science Olympiad Class 6 > Bones and Muscles
Bones and Muscles Video Lecture | Science Olympiad Class 6
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FAQs on Bones and Muscles Video Lecture - Science Olympiad Class 6
| 1. What are bones and muscles? |  |
Ans. Bones are hard, rigid structures that make up the skeletal system in our body. They provide support, protect our organs, and help in movement. Muscles, on the other hand, are soft tissues that work in coordination with bones to enable movement. They contract and relax to allow us to move our body parts.
| 2. How many bones are there in the human body? | |
Ans. There are 206 bones in the human body. These bones are categorized into two main types: axial bones and appendicular bones. Axial bones include the skull, vertebral column, and ribcage, while appendicular bones include the bones of the limbs, shoulder girdle, and pelvic girdle.
| 3. What is the purpose of bones? | |
Ans. Bones serve several purposes in the human body. They provide a framework that supports and gives shape to our body. Bones also protect our vital organs. For example, the skull protects the brain, and the ribcage protects the heart and lungs. Additionally, bones work with muscles to enable movement and play a role in the production of blood cells in the bone marrow.
| 4. How do bones grow? | |
Ans. Bones grow through a process called ossification. During childhood and adolescence, special cells called osteoblasts lay down new bone tissue, which replaces cartilage. This process continues until early adulthood when the bones reach their full length and density. After this stage, bones undergo remodeling, which involves the removal of old bone tissue by cells called osteoclasts and the deposition of new bone tissue by osteoblasts.
| 5. How do muscles work? | |
Ans. Muscles work by contracting and relaxing. When a muscle contracts, it becomes shorter and thicker, pulling on the bones it is attached to and causing movement. This contraction is possible due to the interaction between proteins called actin and myosin within the muscle fibers. When the muscle relaxes, it returns to its original length, allowing the body part to return to its initial position. Muscles work in pairs or groups to produce coordinated movements.
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Dec 22, 2024 Last updated |
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