A(n) _____ is a group of organs that work together.

A(n) ___ is clouding of the natural lens of the eye.

The heart is a(n) ___ that pumps blood throughout the body.

A(n) ___ is not caused by a virus or living organism.

___ is a bone disease that causes bones to lose density.

___ is a disease in which the body system produces insulin but cannot use it properly.

___ is a disease that causes high fluid pressure inside the eye.

Define central nervous system.