Animal tissues can be categorized into four major types: epithelial, connective, muscular, and nervous tissues. 62Epithelial tissues line body cavities and cover surfaces. 62Connective tissues protect, support, and bind other tissues. 64Muscular tissues make body parts move. 67Nervous tissues coordinate the activities of the other tissues and body parts. 68
4.2 Body Cavities and Body Membranes
The internal organs occur within cavities lined by membranes that also cover the organs themselves. 69
4.3 Organ Systems
Organs are grouped into organ systems, each of which has specialized functions. 70The skin contains various tissues and has accessory organs. It is sometimes called the integumentary system. 71
4.4 Homeostasis
Humans have a marked ability to maintain a relatively stable internal environment. All organ systems contribute to homeostasis. 74 s