Question

A. Write short answers.
1. Which bone of the skull can move?
2. What is a joint?
3. What are voluntary muscles?
4. Name the organs of the nervous system.
5. What does the spinal cord do?
B. Explain in a few lines.
1. What jobs does the skeletal system have?
2. What is a ball-and-socket joint?
3. What is a hinge joint? Give one example.
4. How do muscles make bones move?
5. How does exercise help our muscles?​

Answer 1

Answer:

1)=Mandible or jawbone.

2)=A joint is the part of the body where two or more bones meet to allow movement.

3)=Those muscles that can't be controlled one's will (volition) are called voluntary muscles.

4)=Brain and Spinal cord.

5)=The spinal cord do the work of the pathway for messages sent by the brain to the body and from the body to the brain.

B)

1)=The Skeleton system works as a support structure for our body.

Answer 2

Answer:

Ans:1- mandible

The only bone in your skull that forms freely movable joints is your mandible, or jawbone.

Ans:2-A joint is the part of the body where two or more bones meet to allow movement. Generally speaking, the greater the range of movement, the higher the risk of injury because the strength of the joint is reduced. The six types of freely movable joint include ball and socket, saddle, hinge, condyloid, pivot and gliding.

Ans:3-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 and cardiac muscles that are involuntary.

Ans:4-The nervous system has two main parts:

The central nervous system is made up of the brain and spinal cord.

The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.

Ans:5-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.

B)Ans: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.

Ans:2- Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.

Ans:3- Hinge joints are a type of joint that functions much like the hinge on a door, allowing bones to move in one direction back and forth with limited motion along other planes. The fingers, toes, elbows, knees, and ankles contain hinge joints. Hinge joints are complex and contain many muscles and tissues.

Ans:4- 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.

Ans:5- Muscles

Exercise builds and strengthens muscles, which can protect the bones from injury, and support and protect joints affected by arthritis. Strong muscles also give stability and improve balance and coordination. Exercise also improves blood supply to the muscles and increases their capacity to use oxygen.

now its done....