BSC 2011C Lecture Notes - Lecture 15: Loose Connective Tissue, Epithelium, Adipose Tissue
Document Summary
Anatomy is the biological form of an organism. Physiology is the biological function of an organism: stable operating conditions in the internal environment. Animal tissues: 4 fundamental tissue types, epithelial, muscle, connective, nervous. An organ is a group of tissues organized to perform a task. Organs interact physically, chemically or both to perform a task. What do organ systems do: maintain homeostasis. Epithelial tissue: lines bodies surface, cavities, ducts, tubes, one side sits on another tissue while the other side is open to environment, densely compacted cells. Simple epithelium: single layer of cells, cell shapes: squamous, cuboidal, columnar. Stratified epithelium: 2+ layers thick, functions in protection. Cell juntions: tight junctions: hold cells together, gap junction: connect abutting cytoplasm, adhesion junctions (desmosomes): allow cells to stretch. Glands: glandular epithelium, secretory organs derived from epithelium, exocrine glands: secrete products onto free surface via ducts or tubes, endocrine glands: ductless and release products into fluid surrounding gland.
