BIOL121 Lecture 3: Week 1 - Lecture C - Tissues and Membranes
19 Aug 2018
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Document Summary
Tissues: a group of similar cells that have a similar origin and are specialised for a particular function. Histology is the study of tissues: there are 4 primary classes of tissues: Epithelial: layers of cells covering internal or external surfaces, forms gland tissue, required for: Directly into interstitial fluid, no ducts: exocrine. Connective tissue: connected the epithelium to the rest of the body, binding (tendons bind muscles to bone, provide structure and protection, provide immune protection, store energy and produce heat (e. g. fat, transport materials, characteristics: Consist of few cells surrounded by an abundance of extracellular material. Solid extracellular matrix fibres including collagen, reticulin and elastin. Fluid extracellular matrix ground substance including water, glycosaminoglycans and proteoglycans. The type of extracellular (cid:373)atrix deter(cid:373)i(cid:374)es the tissue"s fu(cid:374)ctio(cid:374). For example, solid extracellular matrix allows for protection while fluid extracellular matrix allows for transport. Membranes: composed of epithelial and connective tissues, flat sheets of tissue that form coverings.
