Raven Johnson Biology Chapter 43 Answers to Review Questions 1.
Epithelial cells can be flat, cuboidal, columnar, or stretchy.
They are held together tightly at the edges to form a protective sheet of tissue for the purposes of lining or covering body structures. Mucous membranes line internal cavities such as the digestive tract, are kept moist, and function in secretion, absorption, and protection. Cutaneous membranes are typically dry and cover the outside of the body, functioning primarily in support, but also in secretion and some absorption. A connective tissue is a supporting tissue composed of living cells embedded in a nonliving matrix. The three categories are defensive, structural, and sequestering.