The skeletal system has the job to help protect the body and to help the body to move.
In the human skeleton, there are 206 bones. Humans are vertebrates and being a vertebrate means that we have bones that are located on the inside of the body and this is called an endoskeleton.
Our body is supported by all of our bones that allow us to stand and to sit. The limbs and joints in our body help the bones to be able to move.
The skeleton helps to protect our organs such as our brain, heart and lungs, and other organs.
The skeleton also helps to store calcium and hematopoiesis, which is how the blood produces cellular components such as proteins, plasma, and other cells such as white blood cells, red blood cells, and platelets.
White and red blood cells and platelets are found inside of the bone, and this is part of the bone marrow.
There are two parts of the skeleton, the axial skeleton, and the appendicular skeleton.
The axial skeleton includes the skull and the ribcage and the vertebra column. This is the center of our body.
The pelvis forms the appendicular skeleton which is attached to the axial skeleton. Flat bones are bones that make up the skull, the ribs, and the pelvis.
These bones are called flat bones because they describe their shape.
The flat bones have a spongy or cancellous bone which and the outer shell or the compact bone.
Flat bones help to protect the organs and help to protect the bone marrow.
Long bones are the humerus, the femur, and other bones. The long, middle portion of the long bone is called the diathesis and the end of the long bone is called the epiphysis and the small area between the two is called the metathesis.
The metathesis is also called the growth plate. The growth plate allows people to continue to grow until the growth plate closes.
The long bones are also made up of spongy bones and a compact bone. These bones are used for movement and to frame the body in shape.
There are two different types of bone marrow, red bone marrow, and yellow bone marrow. The red bone marrow has the main function of making red blood cells.
The yellow bone marrow is used to store fat cells. Yellow bone marrow is found in long bones.