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Class 6 Science Chapter 8 Notes

Chapter Name: - Body Movements

Class 6 Science Chapter 8 Notes

Section - A (Keywords with Meaning)

Class 6 science chapter 8 Keywords

A bone column of 33 small bones.

Explanation: –

These small bones are called vertebrae.
The backbone starts from the neck and ends at the bottom of the back. The rib cage is joined with the vertebrae.

A bone arrangement in which the round end of a bone fits into the cavity of the other bone.

Explanation: –

The joint in this type of bone arrangement allows the movement in all directions.

Examples: –

Shoulder joint, hip joints.

The hair-like structure under the body of an earthworm.

The bristle is connected with the muscles and helps to get a good grip on the ground.

The part of the skeleton that is not as hard as the bones and can be bent.

Cartilage help to connect the bones together. It is also found in ear, nose and ribcage.

The hollow space of a bone.

The joint system of the bones, in which the bones can not move.

Examples: –

The joint of the upper jaw.

The methods of the movement of the animals are called gait of the animals. Different creatures use different patterns for their movement.

Examples: –

1. An earthworm uses contraction and expansion of the muscles.

2. Human uses movements of the legs called walking.

3. Snakes crawl on the ground.

4. Birds fly with the help of their wings.

The joint system of the bones that allows the back and forth movement like a door.

Examples: –

Knee and elbow joints.

A band of soft tissues that have the ability to contract.

Explanations: –

They work in pairs to pull the bones. While pulling a bone one muscle of the pair contracts and other relaxes.

Some creatures have an outer skeleton covering their body from outside and helping movements.

Explanation: –
The skeleton is the structure of the bones supporting our bodies. In most of the animals, it is found inside the skin. But in some creatures like cockroaches and crabs, it is found outside.

The bone structure on which we sit is called pelvic bones. They are located below the stomach and above the legs.

The bone joint between the head and the neck.

This joint help our head to move back and forth as well as left and right.

The semi-circular bones joining the chest bone to the backbone and forming a box-like structure are called ribcage.

The 12 ribs on each side of the chest protect the heart and lungs.

The structure or framework consisting of all the bones of and animal supporting the body is called skeleton.

A human skeleton consists of 206 bones at adulthood.

The body shape found in fishes to minimize the water friction while swimming.

Explanation: –

The fishes have a curved shape that is thicker in middle and thinner at the edges. The water flows easily around this shape helping fishes to move easily.

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Class 6 Science Chapter 8 Notes

Section - B (Question - Answer)

Question 1

Fill in the blanks.

(a) Joints of the bones help in the movement of the body.

(b) A combination of bones and cartilages forms the skeleton of the body.

(c) The bones at the elbow are joined by a hinge joint.

(d) The contraction of the muscle pulls the bones during movement.

Question 3

Match the items in Column I with one or more items of Column II.

Column IColumn II
Upper Jawhave fins on the body
Fishhas an outer skeleton
Ribscan fly in the air
Snailis an immovable joint
Cockroachprotect the heart
 shows very slow movements
 have a streamlined body
Column IColumn II
Upper Jawis an immovable joint
Fishhave fins on the body, have a streamlined body
Ribsprotect the heart 
Snailshows very slow movements, 
Cockroachhas an outer skeleton, can fly in the air

Question 4

Answer the following:

Ball and Socket joint

An arrangement of bones in which the round end of a bone fits into the cavity of the other bone. It allows movements in all directions so, it is a movable joint.

Examples: –

Shoulder joint, hip joints.

The lower jaw is the only movable joint in the skull.

Our elbow can not move backwards because the elbow joint is an example of the hinge joint. The hinge joint is a joint system of the bones that allows the back and forth movement like a door.

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Class 6 Science Chapter 8 Notes

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Class 6 Science Chapter 8 Notes

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