HLSC 2F95 Lecture Notes - Lecture 2: Frontal Bone, Adipocyte, Connective Tissue
7 Nov 2016
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Document Summary
Axis of motion: jumping jacks, shoulder raise. Contain 3 basic components: specialized cells, extracellular protein fibers, ground substance fluid. Matrix: make structural framework of the body, transport fluid and dissolve materials, protect organs, support, surround, connect other tissues, store energy, defend the body from microorganisms. Mesenchymal cells-respond to local injury or infection , differentiate into fibroblasts and macrophages. Fibroblasts-one of the two most abundant& are always present, production of all connective tissue fiber. Macrophages-engulf damaged or dead cells, or pathogens that enter, are not abundant. When stimulated they release chemicals that activate the immune system. Melanocytes-synthesize and store melanin, which plays a major role in determining skin colour. Mast cells-found near blood vessels, filled with histamine and heparin, these chemicals are released after injury or infection stimulating local inflammation. Lymphocytes-their numbers increase wherever tissue damage occurs, they then develop plasmocytes which produce antibodies. Neutrophils & esinophils-when an infection occurs macrophages and mast cells attract these.
