The skeletal system is made of __
A.
muscles and tendons
B.
bones and cartilage
C.
vitreous humor
D.
minerals and fat
The Correct Answer and Explanation is:
The correct answer is B. bones and cartilage.
Explanation:
The skeletal system is primarily composed of bones and cartilage, which serve several vital functions in the body.
- Bones: These are the rigid structures that form the skeleton. Bones provide the primary support for the body, giving it shape and structure. They also protect internal organs (such as the brain, heart, and lungs), act as levers to facilitate movement through their connections with muscles, and store minerals and fat. Additionally, bones contain bone marrow, which is crucial for the production of blood cells (hematopoiesis).
- Cartilage: This is a flexible, yet strong connective tissue that is found in various parts of the body. Cartilage cushions joints, reducing friction and allowing smooth movement. It also provides structural support in areas where rigidity is not as critical, such as the ear and the nose. Cartilage plays a role in the development and growth of bones, especially during childhood and adolescence.
Functions of the Skeletal System:
- Support: Bones form the framework of the body, supporting tissues and providing attachment points for muscles.
- Protection: The skeletal system safeguards vital organs (e.g., the rib cage protects the heart and lungs; the skull encases the brain).
- Movement: Bones act as levers that muscles pull on to produce movement. Joints, where two bones meet, are essential for allowing and directing movement.
- Mineral Storage: Bones store minerals like calcium and phosphorus, which can be released into the bloodstream as needed.
- Blood Cell Production: The bone marrow inside bones produces red blood cells, white blood cells, and platelets, essential for oxygen transport, immune responses, and blood clotting.
Incorrect Options:
- A. Muscles and tendons: These are part of the musculoskeletal system, but they are not components of the skeletal system itself.
- C. Vitreous humor: This is a gel-like substance in the eye and is not related to the skeletal system.
- D. Minerals and fat: While these are present in bones, they are not structural components of the skeletal system. Instead, they are substances stored within the bones.
Overall, the skeletal system’s primary components are bones and cartilage, which work together to provide structure, support, and various other essential functions in the body.