yes
Yes. The sinuses are air-filled areas in several bones in the face. They serve to make the skull lighter than if it were made of solid bone.
The mucous membrane-lined cavities found in several bones surrounding the nasal cavities are called paranasal sinuses. These sinuses include the frontal, maxillary, ethmoid, and sphenoid sinuses. They help to lighten the skull, produce mucus, and regulate the resonance of the voice.
The answer is bones. Bones are filled with marrow and have air spaces to make them lighter in weight.
The skull and mandible make up the head.
Yes they make the bird lighter.
Because they have wings and Holes in their bones to make then lighter
Cheetahs have lighter bones than the leopard which would make them a bit less strong.
spin your head around a lot
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.
If your sinuses are effected by a navel piercing that would make you a candidate for the Guinness world book of records. There is no way your sinuses would be effected by a navel piercing the two don't event come close to each other. Your sinuses are in your head, that's the cavity covered by your nose. So relax there is no danger of the two bothering each other.
Not within the center - that part is filled with a clear fluid called the Vitreous Humour - but all the component parts of the eye do have a blood supply.
the head spine