CBSE Class: 6 NCERT Science Chapter: 8 free notes | extra questions | in-text questions | BODY MOVEMENTS | Part I
In the body, places where two parts are seemed to be joined together, which are able to move, bend or rotate, are known as joints.
- ball and socket joints
- pivotal joints
- hinge joints
- fixed joints
The rounded end of one bone that fits into the cavity (which is a hollow space) of the other bone, and also allowing movements in all directions, are known as ball and socket joints.
A cylindrical bone that rotates while being in a ring type of bone, such joints are known as pivotal joints.
What are hinge joints?
The bones that allows only a back and forth movements, such joints are known as hinge joints.
What are fixed joints?
The bones that are joint together but doesn’t allows movement, such joints are known as fixed joints.
Give some examples of ball and socket joints in our body.
Some examples of ball and socket joints in our body are
- wrist joint
- shoulder joint
Give some examples of pivot joints in our body.
Some examples of pivotal joints in our body are
- neck and head joining part
- hip joint
- shoulder joint
Give some examples of hinge joints in our body.
Some examples of hinge joints in our body are
Give some examples of fixed joints in our body.
Some examples of fixed joints in our body are
- Bones in the skull
- teeth in the upper jaw
What do you mean by skeleton?
The bones that wre forming a framework to give a shape to our body, such framework is known as skeleton.
What do you mean by X-ray?
The scans of our body parts (i.e. of bones) to produce an inner image of skeleton, that shows the shape of the bones in our body, such scans are known as x-ray.
What are the parts of the skeleton of a human body?
The parts of the skeleton of a human body are
- bones present in the hand
- rib cage
- shoulder bones
- pelvic bones
The rib cage is located in the chest, joining chest bones & backbones together.
Where is the backbone located?
The backbone is located in the back of our body, which is made of many small bones.
Where is the pelvic bone located?
The pelvic bone is located in the enclose portion of the body below stomach.
Where is the skull located?
The skull is located in the uppermost part of the skeleton that is made up of many bones joined together, that encloses and protects a brain.
Where is the cartilage located?
The cartilage is located in ears and also some other parts of the earth, it is not that hard, can be bent also.
What are muscles?
The swollen region inside different body parts surrounding around them, that helps the bones to move and works in pairs by pulling each other, such is known as muscles.
How do muscles movement help our bones to move? explain.
The muscles in our body helps us to move by the following reasons,
- they work in pairs, only by pulling
- they bulge (becomes smaller in the length) due to contractionAs when one of them (the muscles) contracts, bone is pulled in that direction, while other muscles tend to relax.
- to move the bones in other directions, the relaxed muscle contracts to pull the bone towards its original said position, while the other relax
- Thus, the said two muscles have to work together to move a bone in order to initiate movement.
What is the body structure of an earthworm?
The body structure of an earthworm can be defined below,
- are said to be made up of many rings joined together
- it doesn’t have bones
- secretes a slimy structure, that makes it feel slimy upon touch.
- has large number of tiny bristles (that are hair like structures) projecting out under it’s body
How are earthworms able to move?
The earthworms are able to move
- they have muscles which help in extending and shortening the body for its movement
- also, secretes a slimy structure that helps in the body movement.
- They extend the front part of the body, while keeping the rear portion fixed on the ground.
- then it fixes the front and thus releases the rear end, as it shortens the body and pulls rear part out making it move forward by small distances
- Thus repeating such muscle expansions and contractions, it moves through the soil.
How do earthworms fix their body?
The earthworms fix their body by
- the large number of bristles (that are hair like structures) under their body projecting out, that are connected with their muscles
- this helps in getting a good grip on the ground
How does an earthworm receives nutrition?
The earthworms receive nutrients by eating the soil, and later throws the undigested and waste parts.
How does an earthworm plays an important role in the growth of plants?
Earthworms play an important role in the growth of plants by eating its way through the soil and later throws the undigested part of what it eats, such activities of it helps making the soil more useful for plants.
What is the body structure of a snail like?
The body structure of a snail can be defined below,
- has a round structure, shell, that it carries on its back all the time
- also the outer skeleton, is not made up of bones
- has a thick structure of foot, made of strong muscles and head
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