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Biolog 33 - Chapter 33 Animal Tissues and Organ Systems I...

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Chapter 33: Animal Tissues and Organ Systems I. Epithelial tissue A. Epithelial tissue covers external surfaces and internal cavities and organs. B. Glands are also composed of epithelial tissue. C. Epithelia form boundaries where substances that move into or out of the body must pass through epithelial tissue. D. One surface of the tissue is free and the other adheres to a basement membrane. E. Epithelial tissue forms the skin of many animals. F. Ciliated epithelium lines the respiratory tract. G. Absorption is an important function of epithelial tissue. H. Glandular epithelium secretes chemicals. I. Endocrine glands secrete hormones directly into the extracellular space. J. Exocrine glands often secrete through DUCTS; they secrete mucus, saliva, wax, milk, etc. II. Connective Tissue A. The cells of connective tissue are separated by non-living material. B. Connective tissue binds and supports body parts, protects, fills spaces, stores fat (for energy), and transports materials. C. Loose connective tissue and dense connective tissue contain three kinds of fibers. 1. Collagen fibers provide strength and flexibility. Collagen is the most abundant protein in animal bodies.
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