Question

What are the main parts of our skeletal system? What is a joint? What are the three main parts of joints in a body ? Why we are not able to move our skull and upper jaw but can move our lower jaw ? What are the characteristics of a bird body that helps to fly ? explain how muscles help the
bone to move . what would happen if our neck joint was a Hinge Joint what would happen if the bones of the birds were not Hollow

Answer 1

Answer:
1.)-The skeletal system has two distinctive parts: the axial skeletonand the appendicular skeleton, according to the U.S National Library of Medicine (NLM). The axial skeleton, with a total of 80 bones, consists of the vertebral column, the rib cage and the skull.

2.)-Joint-1)a part of the body where two bones fit together and are able to bend
2)the place where two or more things are fastened or connected together, especially to form a corner

3.)-What Are the Three Different Types of Joints?
Synovial Joints. Synovial joints are the most common type in the human body. ...
Synovial Plane, Hinge and Pivot Joints. Plane joints, also called gliding joints, are located between the small bones in your wrist and between the small bones in your feet. ...
Cartilaginous Joints. ...
Fibrous Joints.

4.)We can moveonly the lower jaw because the upper jaw is connected with the skull by an immovable joint while the lower jaw is connected by a movable joint which makes the movement possible.

5.)light bones – a bird's bones are basically hollow with air sacs and thin, tiny cross pieces to make bones stronger – this reduces the force ofweight. a rigid skeleton to provide firm attachments for powerful flight muscles – this helps with the force of thrust. a streamlined body – this helps reduce the force of drag.

6.)Muscles move body parts by contracting and then relaxing. Yourmuscles can pull bones, but they can't push them back to their original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.

7)A hinge joint is that joint which helps in the movement of bones in along one axis. Pivot joints on the other hand are joints which allows free movement. So, if neck joint was a hige joint and a pivot joint , it would only move along one restricted axis . It would not able to move freely thus, limiting it's movement and creating problem in our daily activity.
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Answer 2

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