ANAT 101 Chapter Notes - Chapter 2: Epiglottis, Hemidesmosome, Hyaline

• School: Queen's University
• Department: Anatomy and Cell Biology
• Course: ANAT 101
• Professor: Richard Oko

Document Summary

Tissues: collections of specialized cells and cell products that perform a limited number of functions. They recognize four different types of tissues: epithelial, connective, muscle, neural. Epithelia: layers of cells that cover internal or external surface. A free (apical) surface exposed to the environment or to an internal chamber or passageway. Attachment to underlying connective tissue by a basement membrane. Avascular (absence of blood vessels) and must obtain nutrients across their attached surface from deeper tissues or across their exposed surfaces. Continual replacement or regeneration of epithelial cells that are damaged or lost at the exposed surface. Form selective barriers that separate the deep tissues of the body from the external environment. Glandular epithelium: most or all of the cells actively produce secretions. Exocrine: discharged onto the surface of the epithelium (e. g. , perspiration) Endocrine: released into surrounding tissue and blood. These are called hormones and act as chemical messengers. Glands: composed of fluid secreting ells derived from epithelia.