resonator
A resonator.
A hollow chamber filled with air that amplifies sound when its air vibrates is called a resonating chamber or a sound chamber. It is designed to enhance and project sound waves produced within it, creating a louder and more resonant sound.
the morula develops into a hollow, fluid-filled ball of cells called a blastocyst.
Question?
Most are not. Some may have hollow parts, but most are filled with lead.
solid.
Yes, and filled with air.
epiphysis
cochlear duct
Assuming your talking about the eye...it would be the aqueous humor. The aqueous humor is produced by the ciliary processes in the ciliary body. It flows from the ciliary body into the anterior chamber. It travels out through the trabecular meshwork and into the Canal of Schlemm. It is then delivered to the bloodstream via anterior ciliary veins.
There is an anterior chamber and a posterior chamber to the eye. The anterior chamber is from the lens and iris forward to the back of the cornea. The posterior chamber is from the back of the lens to the retina. The anterior chamber is filled with aqueous. The posterior chamber is filled with vitreous.
bone marrow