Define the term tissue

Overview There are several different types of epithelial cells based on their shape and arrangement. What is the epithelium? The epithelium is a type of body tissue that forms the covering on all internal and external surfaces of your body, lines body cavities and hollow organs and is the major tissue in glands. Epithelial tissue has a variety of functions depending on where it’s located in your body, including protection, secretion and absorption. The organs in your body are composed of four basic types of tissue, including: • Epithelial. • Connective. • Muscular. • Nervous. All substances that enter or leave an organ must cross the epithelial tissue first. You have many different kinds of epithelial tissue throughout your body. Some examples of epithelial tissue include: • The outer layer of your skin (epidermis). • The lining of your intestines. • The lining of your respiratory tract. • The lining of your abdominal cavity. • Your sweat glands. What are epithelial cells? Epithelial tissue is made up of epithelial cells. The cells can be different shapes and can be arranged in a single layer or multiple layers depending on where they are in your body and what kind of functions they have. In biology, a cell is the smallest unit that can live on its own. Cells make up all living organisms and the tissues of your body. More than 30 trillion cells make up your body. A cell has three main parts: • The cell membrane: The cell membrane surrounds the cell and controls the substan...

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What is Tissue? A tissue, in biology, is defined as a group of cells that possess a similar structure and perform a specific function. The word tissue originates from French, which means “to weave.” Tissues Types In animals, there are 4 types of tissues, namely: • Muscle tissue (cardiac, skeletal and smooth muscle tissues) • Connective tissue (cartilage, blood, bone) • Nervous tissue (neurons and neuroglia) • Epithelial tissue (simple epithelium, simple cuboidal, simple columnar epithelium, etc) Plants have their own set of tissues, namely: • Dermal Tissues (epidermal cells, stomata, trichomes) • Ground tissues (Collenchyma, parenchyma, sclerenchyma) • Vascular tissue (Vessel elements, tracheids, companion cells and sieve tubes) Concept of Tissues The concept of tissues can be traced back to 1801 when it was introduced by Xavier Bichat, a French anatomist and pathologist. He had proposed that tissues are a central element in human anatomy, concluding that organs are essentially a collection of distinct tissues. Main Article: Explore more about tissues or other related topics by registering at BYJU’S Biology. Further Reading: • • •

Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved. tissue Past participle: tissued Gerund: tissuing Imperative tissue tissue Present I tissue you tissue he/she/it tissues we tissue you tissue they tissue Preterite I tissued you tissued he/she/it tissued we tissued you tissued they tissued Present Continuous I am tissuing you are tissuing he/she/it is tissuing we are tissuing you are tissuing they are tissuing Present Perfect I have tissued you have tissued he/she/it has tissued we have tissued you have tissued they have tissued Past Continuous I was tissuing you were tissuing he/she/it was tissuing we were tissuing you were tissuing they were tissuing Past Perfect I had tissued you had tissued he/she/it had tissued we had tissued you had tissued they had tissued Future I will tissue you will tissue he/she/it will tissue we will tissue you will tissue they will tissue Future Perfect I will have tissued you will have tissued he/she/it will have tissued we will have tissued you will have tissued they will have tissued Future Continuous I will be tissuing you will be tissuing he/she/it will be tissuing we will be tissuing you will be tissuing they will be tissuing Present Perfect Continuous I have been tissuing you have been tissuing he/she/it has been tissuing we have been tissuing you have been tissuing they have been tissuing Future Perfect Continuous I will have been tissuing you will have been tissuing he/she/it will h...

It was this: I asked myself whether there was not in his soul some deep-rooted instinct of creation, which the circumstances of his life had obscured, but which grew relentlessly, as a cancer may grow in the living tissues, till at last it took possession of his whole being and forced him irresistibly to action.