Biology B2 - Tissues, Organs And Organ Systems

B2.2 Tissues, Organs And Organ Systems.

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Deffinition Of Tissue.

The definition of tissue is any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.

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Examples Of Tissue.

Some examples of tissue is bone tissue, muscle tissue and plant stem tissue.

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Definition Of An Organ.

An organ is a group of tissues that perform a specific function or group of functions.

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The Tissues An Organ Is Made From.

For example the stomach is made from:

Connective Tissue: This is the blood in the walls of the stomach.

Nervous Tissue: This controls acid production in the stomach. It also helps contract and coordinate stomach muscle.

Epithelial Tissue: This protects the stomach against acid. It covers the inside of the stomach. It also has folds to increase surface area.

Muscle Tissue: This mixes stomach contents and forces them towards the lower intestines. It is in between the epithelial tissue.

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Major Organs In The Digestive System.

First of all it is the mouth, then the tongue, then the esophagus, then the stomach. After that, it is the liver which secretes bile juice, then the pancreas. After that, it passes to the small intestine, then to the large intestine.

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Function Of Organs In The Digestive System - 1

Mouth - It breaks down food mechanically by the action of the teeth and begins the digestion of starch through the enzyme amylase in the saliva.

Tongue - The tongue rolls the food into balls and pushes them to the back of the mouth cavity for swallowing.

Esophagus - Its a tube running from the throat to the stomach.

Stomach - The stomach's main function is digestion. It does this by, storing the food we eat, breaking down the food into a liquidly mixture called chyme, mixing enzymes which is are chemicals that break down food, slowly empties that liquidly mixture into the small intestine.

Liver - This organ plays a major role in metabolism and has a number of functions in the body, including glycogen storage, decomposition of red blood cells, plasma protein synthesis, hormone production, and detoxification.

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Function Of Organs In The Digestive System - 2

Pancreas - The pancreas is an organ located in the abdomen. It plays an essential role in converting the food we eat into fuel for the body's cells. The pancreas has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar.

Small intestine - The small intestine is responsible for absorbing most of the nutrients found within your food. By the time ingested food reaches the small intestine, it has been mechanically broken down into a liquid.

large intestine - Its principle function is to reabsorb water and maintains the fluid balance of the body. Certain vitamins are also taken in through the large intestinal wall.

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Organs In Plants.

The four main plant organs are the flower, stem, leaves and roots.

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Function Of Tissues In Plants.

Epidermal tissue - Covers the plant

Mesophyll - Carries out photosynthesis

Xylem and phloem - Transport of substances around the plant

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