Human Skeletal System And Its Functions

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Transcript

00:00Hi kids! Today we will learn about the human skeletal system. So let's start!

00:10Our skeletal system is the internal framework of our body.

00:16It is composed of 270 bones at the time of our birth.

00:25And later on, as we grow, the number of bones reduces to 206 by our adulthood.

00:36Our skeletal system has six major functions.

00:41It provides support to the body, helps in movement of the body and its various parts.

00:51It protects the internal organs.

00:55It produces blood cells, store ions and regulate endocrine.

01:04Now let's learn the role of skeletal system in a bit detail.

01:12First is support.

01:16Skeletal system forms the framework that supports the body and maintains its shape.

01:25Movement.

01:27There are various types of joints in our skeletal system that allows various types of movements.

01:34Like we can revolve our wrist.

01:37We can move our neck left, right, up, down.

01:43All types of movements in our body are possible due to the collective action of bones and muscles.

01:55The skeletal system protects our internal organs from any kind of injury.

02:03Example.

02:04Our brain stays protected inside the hard bony cover called a skull.

02:12Our rib cage protects the delicate organs, lungs and heart.

02:20The blood cells of our body are produced in the bone marrow which lies inside the bones.

02:30Production of blood cells is called hemopoiesis.

02:36In children, hemopoiesis occurs primarily in the marrow of the long bones such as femur and tibia.

02:47One of the most important functions of bones is to store calcium and iron.

02:55So we learnt about the functions or role of our skeletal system.

03:01Now let's learn about the structure and composition of our bones.

03:07Bones comes in different shapes as well as sizes.

03:13Bones have a very complex internal and external structure.

03:19Bones are light in weight but very strong and hard.

03:25Bones have a hard outer layer called cortical or compact bone which is strong, dense and tough.

03:37And a spongy inner layer called cancellous bone.

03:44Bones of a living person have their own blood vessels and are made of living cells which help them to grow and to repair themselves.

03:57Bones consist of 65% of inorganic matter and 35% of organic matter.

04:10Inorganic matter constitutes of calcium and phosphorus but there are also traces of magnesium, potassium, zinc and copper.

04:25Organic matter constitutes mainly of collagen and protein.

04:33At the time of birth we have 270 bones but many of these bones fuse together later on.

04:44And an adult body has 206 bones.

04:51We will learn the names of bones in our skeletal system in our next assignment.

04:58Well, the largest bone in the human body is femur or the thigh bone.

05:07And the smallest bone is the stapes which is present in our middle ear.

05:17So kids, today we learned a lot about our skeletal system.

05:23Now you may go ahead and take a quiz to learn more.

05:27Bye-bye.