a. Collarbone
b. breastbone
C. shoulder bone
5. The bunch of nerves running through the vertebral column is called the
a. spinal cord
b. spinal column
C. vertebral cord
E. Write short answers.
1. What are the functions of the skeletal system?
2. How are voluntary muscles different from involuntary muscles?
3. Name two minerals that are important for healthy bones.
4. What is the job of the spinal cord?
5. Which part of a bone has bone marrow? What is the most important job of bone marrow?
F. Explain briefly.
1. Explain how the muscles work to make the bones move.
2. What is a ball-and-socketjoint? Give two examples.
3. What does 'good posture' mean? Mention any three rules related to it.
23
Answers
Answer:
5) vertebral cord
Short Answer type question
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. The skeletal system is also called the musculoskeletal system.
2)Voluntary Muscles
Voluntary muscles are long, multinucleated cells, containing sarcomeres arranged into bundles. These muscles are composed of cylindrical fibers and are usually attached to bones and the skin. They play an important role in allowing the body to move by contracting and relaxing and their actions are mainly under the control of the somatosensory nervous system. These voluntary muscles include skeletal muscles.
Involuntary Muscles
Involuntary muscles are striated and branched in the case of cardiac muscle. The actions of involuntary muscles are mainly controlled by the autonomic nervous system in the body. These involuntary muscles include smooth muscles and cardiac muscles.
3) The health and strength of our bones rely on a balanced diet and a steady stream of nutrients, most importantly, calcium and Vitamin D. Calcium is a mineral that people need to build and maintain strong bones and teeth.
4) The brain and spinal cord are your body's central nervous system. The brain is the command center for your body, and the spinal cord is the pathway for messages sent by the brain to the body and from the body to the brain.
5) Bone marrow is a spongy substance found in the center of the bones. It manufactures bone marrow stem cells and other substances, which in turn produce blood cells. Each type of blood cell made by the bone marrow has an important job. Red blood cells carry oxygen to tissues in the body.
F. Explain beriefly
1).Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
2).Examples of this form of articulation are found in the hip, where the round head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis; and in the shoulder joint, where the rounded upper extremity of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade.
3).Good posture should be effortless and tired, it should be painless and symmetrical. Chair : The chair must be adjustable in height, and allow an inclination. The back can be maintained in good working conditions.
Connexion
Démo
NON CLASSÉ
3 rules for good posture at work
15 juin 2017
You spend a lot of time on your computer? Ergonomics at work is important because many people complain of muscle and bone pain. Why ? Because your body has been made to be constantly moving.
However, being able to adopt a good ergonomic posture avoids pain
Here are 5 golden rules to adopt for good ergonomics at work
Good sitting position
Good posture should be effortless and tired, it should be painless and symmetrical.
Head and spine :
The head should be aligned with the spine. In the sitting position, the knees and ankles are slightly “open”. The upper body should be slightly tilted forward but aligned
Wrists :
The wrists are aligned with the forearms
Adjust your equipment
Chair :
The chair must be adjustable in height, and allow an inclination. The back can be maintained in good working conditions. Opt for a chair that pivots at the base to prevent twisting, and add a footrest to limit lumbar tensions.
Computer screen :
It should be placed at an angle of 10 to 30 degrees below the line of sight (ie when you look horizontally in front of you).
If you are using a laptop :
In case you are using a laptop, it is necessary to use another computer monitor. This makes it possible to adopt an ideal ergonomic position for the body
Step-by-step explanation:
I hope it's helpful
Answer:
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