Tissue ऊतक

Tissue ऊतक

ऊतक (tissue) किसी जीव के शरीर में कोशिकाओं के ऐसे समूह को कहते हैं जिनकी उत्पत्ति एक समान हो तथा वे एक विशेष कार्य करती हो। अधिकांशतः ऊतको का आकार एंव आकृति एक समान होती है। परंतु कभी कभी कुछ उतकों के आकार एंव आकृति मे असमानता पाई जाती है, मगर उनकी उत्पत्ति एंव कार्य समान ही होते हैं। ऊतक मुख्यत: पाँच प्रकार के होते हैं: उपकला, संयोजी ऊतक, स्केलेरस ऊतक, पेशी ऊतक तथा तंत्रिका ऊतक।







In Biology, tissue is a cellular organizational level intermediate between cells and a complete organism. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.




The study of tissue is known as histology or, in connection with disease, histopathology. The classical tools for studying tissues are the paraffin block in which tissue is embedded and then sectioned, the histological stain, and the optical microscope. In the last couple of decades, developments in electron microscopy,

immunofluorescence, and the use of frozen tissue sections have enhanced the detail that can be observed in tissues. With these tools, the classical appearances of tissues can be examined in health and disease, enabling considerable refinement of clinical diagnosis and