What is the thick layer of bone surrounding the medullary cavity composed of?

The thick layer of bone surrounding the medullary cavity is called Endosteum.

Explanation:

Endosteum is membrane formed of reticular connective tissues. It is lining across the inner surface of bony tissue. This forms the medullary cavity of bone.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.

energy and particles