Important Notes for CBSE Class 6 Science Chapter 8 – Body Movements. Body Movements Class 6 Notes and Study Material Download in PDF form.
Body Movements Notes | Body Movements Class 6 Notes | Body Movements Quick Revision | Body Movements Class 6 Quick Revision Notes | Science Class 6 Ch 8 Notes | NCERT Class 6 Science Chapter 8 Notes PDF.
Human skeleton :
- The human skeleton and skeletal system is made up of 206 bone.
- The bone of our body act as framework or give it shape .
- The bone are also protect internal organ .
Parts of human skeleton
Skull :
- The bones of skull is hardest of all the bones.
- Skull bones protect our brain and rest of the facial bone give shape and frame to our face.
The spine :
- The spine also called vertebral column or back bone.
- It consists 33 small bone.
- It start from the neck down to the tail bone or hip region.
The rib cage:
- Joint the chest bone and back bone together to form cage .
- It protects our internal chest region organ lung , heart .
Collar bone :
- Collar bone are either side of the neck.
- The collar bone is attached to the shoulder blade and breastbone.
- It give shape to the shoulder and help in movement of arm.
Fore arm:
- The arm has two part the upper arm and fore arm joint at the elbow.
- One long bone run through upper arm , and it give shape to the fore arm.
The hip bone :
- The hip bone is form by three bone fused together , two hip bone is joint with vertebrae in hip region.
- The hip bone and vertebrae joined to form the pelvic girdle.
Joints:
The place where two or more bone meet in the skeleton . We can move or bend only at those points.
- Ligament connect the bone forming the joint .
- The end of the bone covered with cartilage.
- A thick oily liquid present – lubrication.
Fixed joint :
- Some joint do not allow any movement these are fixed joint.
- Example : joint between teeth and jaw bone.
Ball and socket joint :
- These joint allow the greatest freedom of movement or are the most Mobile.
- Example : hip and shoulders joint.
Pivotal joint :
- A cylindrical bone turn in a ring type bone . Full rotation not possible.
- Example : neck attached to the head help in side way back and fourth movement.
Hinge joint :
Link door hing , only back and forth movement possible.
Example : ankle , elbow , knee .
Movement :
- Most animals move from one place to another place .
- This type of movement is called locomotion.
- We use our legs for locomotion.
- Animals that have vertebral column are called vertebrates .
- All vertebrates move with the help of bone and muscle.
Snake :
- Snake can move very fast due to flexibility of their back bone .
- Snake vertebrates column is made up of 100-400 vertebrae that are connected to ball and socket joint.
Fish :
- The head and tail of the fish is smaller then the middle portion , this type of the body is called as streamlined.
- The shape is such that water can flow around it easily and allow the fish to move easily.
- The skeleton of dish is covered with very strong muscles.
Birds :
- A smooth streamlined body, offer little resistance to the flow of air .
- A skeleton made up of Hallow bones make birds light so it can hold body up in the air .
- Big strong flight muscles attached to the wings, helps it flaps it’s wings .
Invertebrates move :
- Most of the animals are invertebrates , they do not have vertebral column or internal skeleton made of bones.
Insect :
- Insect have hard covering over their body , or an exoskeleton.
- When insect walk three legs two on side and one on the other , support the body while the other three move the body forward .
- Most of the insect can fly with the help of two pairs of wings
Snail :
- Snails have soft body which they can pull back into their heavy shell.
- They have large flat foot which secret slimysubstance , with the help they move forward.
- The movement of the foot is contracted by muscle attached to it.
Earthworm :
- The body of earthworm is made up of many rings joined end to end .
- An earthworm does not have bones.
- Movement of Earthworm is first extend to front part blog the body keeping their half portion fixed to the ground.