Answer these.
1. What are the three jobs of the skeletal system?
2. Name two types of joints.
3. Which type of joint lets us move most freely?
4. What are voluntary muscles?
5. Why do muscles work in pairs?
6. Name the bones to which the ribs are attached.
Answers
Answer:
1. 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.
2. Shoulder joint and knee joint.
3. Synovial joints move in many directions. The main joints of the body — such as those found at the hip, shoulders, elbows, knees, wrists, and ankles — are freely movable. They are filled with synovial fluid, which acts as a lubricant to help the joints move easily.
4. Skeletal muscle, also called voluntary muscle, in vertebrates, most common of the three types of muscle in the body. ... Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other.
5. Muscles work in pairs and sometimes in more than pairs (2) because it makes the movement smooth. The muscle that is making the move is called the prime mover while another is called the antagonist and it resists the move. ... Sometimes the joint will have to be held in place and muscles called fixators will have this job.
6. The thoracic cage is formed by the 12 pairs of ribs with their costal cartilages and the sternum. The ribs are attached posteriorly to the 12 thoracic vertebrae and most are anchored anteriorly either directly or indirectly to the sternum.
Answer:
1. 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.
2. Ball and socket joints, pivot joints, hinge joints, ellipsoidal joints and so on.
3. Synovial joints move in many directions. The main joints of the body — such as those found at the hip, shoulders, elbows, knees, wrists, and ankles — are freely movable. They are filled with synovial fluid, which acts as a lubricant to help the joints move easily.
4. Those muscles that can be controlled at one's will (volition) are called voluntary muscles. Those that are not are referred to as involuntary muscles. The skeletal muscles are voluntary muscles as opposed to smooth.
5. When a muscle relaxes, it goes back to its normal size. Muscles can only pull and cannot push. Therefore muscles have to work in pairs to move a joint. One muscle will contract and pull a joint one way and another muscle will contract and pull it the other.
6. The ribs are attached posteriorly to the 12 thoracic vertebrae and most are anchored anteriorly either directly or indirectly to the sternum. The thoracic cage functions to protect the heart and lungs. The sternum consists of the manubrium, body, and xiphoid process.
Explanation:
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