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A group of organs working together to perform a particular function is called an organ system.
Examples:

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The skeletal system consists of bones present in our body. These bones form a rigid framework that supports the body, and also gives it a definite shape.
It also performs some other important functions, like it
helps us to move around, bend, and protects the delicate internal organs of our body. This rigid framework of bones is called a skeleton.

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There are 206 bones in an adult
human skeleton.
Bones are mainly made up of minerals such as calcium and phosphorus.
Calcium makes the bones strong.
The bones are thus strong enough to support the entire weight of our body.

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The human body has different types of bones. They are of different shapes and sizes.
● Bones of the limbs, including those of the fingers and toes, are long.
● Bones of the wrist and ankle are short.
● Most of the bones of the skull and the breastbone are flat in shape.
● The bones of the spine, hips, and some of the bones of the skull are irregular in
shape.

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i)Skull
ii)Backbone
iii)Ribcage
iv)Limbs
v)Jawbone
vi)Girdle bones

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Structure: It is made up of 22 bones, of which 8 bones form part of skull(that protects brain) and remaining 14 bones form the face. All bones in the skull are fixed and immovable , except the lower jaw.
Functions: i) It covers and protects brain
ii)It also gives shape to the face.
iii)The movable lower jaw helps us to talk and eat(teeth).

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The jawbone is the U-shaped bone of the lower jaw.
Structure:It is the largest and strongest bone in the skull. It is the only bone in the skull that can move.
Function:It helps us to move our mouth so that we can chew food.

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It is a long and flexible bony structure. It is also known as the vertebral column or spine.
Structure:It is made up of 33 small, ring-like bones. The individual small bones are called vertebra.
Functions:The backbone encloses and protects the delicate spinal cord.

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It is a bony structure present in the chest region.
Structure:It is made up of 12 pairs of thin, curved bones called ribs. Along , flat bone called the sternum, is present at the centre of the chest and holds these ribs together in the front. At the back, the ribs are held together by the spine or backbone. However the last 2 pairs of ribs are not attached to sternum, they are called floating ribs.
Function: Ribcage protects the delicate organs such as heart and lungs.

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Human beings have 4 limbs:pair of upper limbs(arms) and a pair of lower limbs(legs)

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It has 2 parts,upper arm and lower arm. The bone present in upper arm, called humerus, is joined to the 2 bones of the lower arm at elbow region.
Functions:Its bones along with muscles and joints causes movements of arms,and thus helps in doing activities such as writing, eating and lifting things.

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It has 2 parts, upper leg and lower leg.Upper leg has longest bone in the body , called femur (thigh bone).
Function:Its bones along with muscles and joints causes movement of legs and thus helps to walk and run.

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It is a bony, ring-like structure. There are 2 Girdles in our body:Shoulder girdle and hip girdle.

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A place in the skeleton where 2 or more bones connect. Bones are held together at the joints with the help of ligament. At the joints, the surfaces of bones are covered with cartilage
Types of joints:i)movable
ii)immovable

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i)Ball-and-socket joint
ii)Hinge joint
iii)Pivot joint
iv)Gliding Joint

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They are the soft tissues present at various places in our body. They do everything from moving our bones and organs  to contracting and relaxing our heart. There are over 600 different muscles in our body. They remain attached to bones through tendons.
Types of muscles:i)voluntary muscles
ii)involuntary muscles

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Those muscles whose movements ca be controlled by us.

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They work on their own and their movements cannot be controlled by us.