1. AL-HUDA SCHOOL
Campus III (Boys Section)
Science
Grade III
Q: Define skeleton?
A: The skeleton is the entire collection of bones inside our body.
Q: What is the main function of skeleton?
A: The skeletal system is one of the major systems of the human body, and has four major
functions:
1. It protects vital organs, such as the brain, heart, and lungs.
2. It supports the body and gives us our distinctive shape. Without our skeleton, we would
look more like a slug.
3. It allows us to move in particular ways.
4. It makes new blood cells to maintain a healthy bloodstream.
Q. how many bones are there in human body?
A. 206
Q: define bone?
A. Bone is a type of tissue. It is a hard tissue.
Q. Describe the structure of bone?
A. there is four layers of bone.
1. First layer consist of nerve and blood vessels.
2. Second layer consist of compact bone.
3. Third layer consist of spongy bone.
4. Fourth layer consist of bone marrow.
Q: define bone marrow?
A: bone marrow is a jelly like substance. It consists of new red blood cells.
Q: which bone is the longest bone in human body?
A: thigh bone.
Q: which bone is the shortest in the human body?
A: ear bone.
Q: define fracture?
A: fracture is a condition in which bone is broken by high stress or pressure.
Q: how broken bone is healed up?
A: the following three steps occur in the formation of bone.
1. Blood clot formation at the two end of the broken bone.
2. Bony swelling around the broken end.
3. Slight swelling of the bone remains and the two ends have joined.