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· The skeletal system is a framework of 206 bones. An adult human body has 206 bones.
· It gives form, shape, size and support to our body.
· It also protects the soft organs inside our body.
· Our body cannot stand upright without a skeleton.
· The skull protects delicate organs like the brain and eyes.
· The ribs protect the lungs and heart.
· The bones help the body in movements.
· A joint is a place where two or more bones meet.
· The joints help us to move our bones and so move our body parts.
· Blood cells are produced in the bones.
· Stores and releases minerals and fat.
· It acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium, and phosphorus.
The different parts of the skeleton system are:
3. Spinal Cord
The skull acts like a helmet and protect the brain. The skull protects the brain.
Bones in the skull – 22
Cranial bones (8) Facial bones (14)
Ribs form a cage of bones around the chest called the rib cage. It protects some of our vital organs like Lungs and Heart.
Most people have 12 pairs of ribs.
They are directly attached to the Sternum. Pair of Ribs 1 -7 are called true ribs.
They are indirectly attached to the sternum through the cartilage of 7th Rib. Pair of Ribs 8-10 are called False ribs.
These ribs are not attached to the sternum. Last 2 pairs of ribs are floating ribs.
BACKBONE / VERTEBRAL COLUMN
The backbone surrounds and protects the spinal cord.
The vertebral column is made up of 33 small bones called Vertebrae as this helps us to move our back otherwise our backbone would be stiff and no movement will be possible.
Arms and legs are called limbs. So all the bones present in arms and Legs come under limb bones.
They help us inn doing many activities and in moving from one place to another.
The fore limb and hind limb are also part of skeletal system.
We have our e-books published on Amazon for Grade 3 and Grade 4. The books serve as an important guide for Science Olympiads organized by SOF, Silverzone, Unified Council and others. Books are designed to help students understand key science concepts.
The key highlights of the book are:
· Well explained topics
· Use of diagrams and images for students to visualize
· Test exercise after each chapter for self-assessment and evaluation
· Interesting facts sections spread across the book
Here are the links: