A sinus is an air cavity within certain bones.

Sinus

A cavity within the bones or tissues, often referring to those in the nasal area that are lined with mucous membranes.

Cavities

Dental decay resulting in holes in the teeth.

Bones

The rigid organs that constitute part of the endoskeleton of vertebrates, providing structure and protection and assisting in movement.

Verified Answer

Final Answer :

True

Explanation :

This statement is true. Sinuses are air-filled spaces within bones such as the skull and facial bones.

Learning Objectives