bone marrow
The hollow part of bones are mostly filled with Red Marrow
birds fly into space due to their hollow bones
there is more space between the bones so they can fly
Hollow bones are hollow bones. Birds have hollow bones to make them lighter for flight and to help keep their body temperature down.
The middle ear is an air-filled space because it helps transmit sound waves from the outer ear to the inner ear. This air-filled space allows for efficient movement of the eardrum, tiny bones, and oval window, which are essential in the process of hearing.
Air-filled spaces in bones are called sinuses. These are hollow cavities within the bones that help to reduce the bone's weight while maintaining strength. The most well-known sinuses are the paranasal sinuses, found in the skull bones surrounding the nasal cavity.
It is the space where you will find bone marrow, which is where Red Blood Cells and White Blood Cells are formed
An air-filled bony cavity is a hollow space within a bone that contains air. These cavities are found in certain bones like the sinuses of the skull, where they help to reduce the weight of the bone and resonate sound.
The middle ear contains the three smallest bones in the body: the malleus, incus, and stapes, collectively known as the ossicles. These bones are inside an air-filled space and transmit sound vibrations from the eardrum to the inner ear.
At birth, all bone marrow is red. With age, more and more of it is converted to the yellow type. About half of adult bone marrow is red. Red marrow is found mainly in the flat bones, such as the hip bone, breast bone, skull, ribs, vertebrae and shoulder blades, and in the cancellous ("spongy") material at the epiphyseal ends of the long bones such as the femur and humerus. Yellow marrow is found in the hollow interior of the middle portion of long bones.
Evacuated
The cavity between bones at the joint is known as the synovial cavity. This space is filled with synovial fluid, which helps to reduce friction and facilitate smooth movement of the bones at the joint.