_______ epithelial cells form the tissue that protects the kidney tubules and covers the ovaries.

The _______ are protective coverings on the brain and spinal cord.

_______ tissue can be described as soft and rubbery or hard and rigid.

The cavities of knee and shoulder joints are lined with _______ membranes.

Three types of serous membranes are _______, _______, and _______.

The smallest living unit of structure in the body is the _______.

The outer boundary of a cell is the _______.

_______ cells are square-like and flat.

Tumors can be _______ or _______.

_______ is the material that forms cells.