Chapter 4 - Histology-.docx - 4 Histology Module 4.1 Introduction to Tissues Build Your Own Glossary Key Terms for Module 4.1 Term Epithelial tissue

Chapter 4 - Histology-.docx - 4 Histology Module 4.1...

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4 Histology Module 4.1: Introduction to Tissues Build Your Own Glossary Key Terms for Module 4.1 Term Definition Epithelial tissue Tissue type composed of epithelial and a thin basal layer of extracellular matrix; it covers and lines all body surfaces and hollow organs. Connective tissue Tissue characterized by extensive extracellular matrix; functions in support, protection and transport. Muscle tissue Tissue specialized for contraction Nervous tissue Tissue that makes up the majority of the brain, spinal cord, and nerves. Unique extracellular matrix Extracellular matrix Substance in a tissue outside of the cells that consists of extracellular fluid, ground substance, and protein fibers. Ground substance Amorphous component of the extracellular matrix containing water; proteoglycans, glycosaminoglycans, and other molecules. Collagen fibers Protein fibers in the extracellular matrix of a tissue that are composed of the protein collagen and give a tissue tensile strength. Elastic fibers Protein fibers in the extracellular matrix of a tissue that give a tissue extensibility and elasticity. Reticular fibers Thin protein fibers in the extracellular matrix of a tissue that form “nets” within organs such a spleen and lymph nodes and form supportive networks around blood vessels and nerves. Tight junction Intercellular junctions that hold cells tightly together in a tissue and make the space between them relatively, impermeable. Desmosome Intercellular junctions that hold cells together in a tissue to increase the tissue’s resistance to mechanical stress.
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