Short Answer Questions Type-II (Answer in 30-40 words).
1. What are the different types of freely movable joints ? Give an example of their location in the
human body.
2. Name the features which help the birds to fly.
3. How are joints different from ligament?
4. List out the functions of the human skeleton.
Answers
Answer:
1. Ball and socket joint – the rounded head of one bone sits within the cup of another, such as the hip joint or shoulder joint. ...
Saddle joint – this permits movement back and forth and from side to side, but does not allow rotation, such as the joint at the base of the thumb.
2. Flying birds have lightweight, smooth feathers – this reduces the forces of weight and drag.
3. Ligaments connect bones together. Tendons. Tendons (another type of tough connective tissue) on each side of a joint attach to muscles that control movement of the joint. Tendons connect muscles to bones...
4. The skeletal system works as a support structure for your body. It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals. The skeletal system is also called the musculoskeletal system.
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Explanation:
1)The six types of freely movable joint include:
Ball and socket joint – the rounded head of one bone sits within the cup of another, such as the hip joint or shoulder joint. Movement in all directions is allowed.
Saddle joint – this permits movement back and forth and from side to side, but does not allow rotation, such as the joint at the base of the thumb.
Hinge joint – the two bones open and close in one direction only (along one plane) like a door, such as the knee and elbow joints.
Condyloid joint – this permits movement without rotation, such as in the jaw or finger joints.
Pivot joint – one bone swivels around the ring formed by another bone, such as the joint between the first and second vertebrae in the neck.
Gliding joint – or plane joint. Smooth surfaces slip over one another, allowing limited movement, such as the wrist joints.
2)Physical features
Flying birds have: lightweight, smooth feathers – this reduces the forces of weight and drag. a beak, instead of heavy, bony jaws and teeth – this reduces the force of weight. an enlarged breastbone called a sternum for flight muscle attachment – this helps with the force of thrust.
3)ligament is a band of tissue that connects bones to each other, and ensures the joint is stable, whereas cartilage is line of connective tissue that works as a padding between the bones.
4)The major functions of the skeletal system are body support, facilitation of movement, protection of internal organs, storage of minerals and fat, and blood cell formation