Image Of Internal Organs In Human Body – In a multicellular organism, an organ is a collection of tissues that are joined together into a structural unit to serve a common function.

In the hierarchy of life, an organ lies between tissue and an organ system. Tissues are formed from the same type of cells to act together in a function. Tissues of different types combine to form an organ that has a specific function. The intestinal wall, for example, is formed by epithelial tissue and smooth muscle tissue.

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Two or more organs that work together in the performance of a specific body function form an organ system, also known as a biological system or body system.

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The tissues of an organ can be broadly categorized as parchyma, the functional tissue, and stroma, the structural tissue with supporting, connective, or accessory functions. For example, the tissue of the gland that makes the hormones is the parchyma, while the stroma includes the nerves that innervate the parchyma, the blood vessels that oxygenate and nourish it and carry away metabolic waste, and the connective tissues that t a suitable place to lay down and anchor. The main tissues that make up an organ have common embryological origins, such as arising from the same germ layer. Organs exist in most multicellular organisms. In unicellular organisms such as members of the Eukaryotes, the functional analogue of an organ is known as an organelle. In plants there are three main organs.

The abdominal organs can be classified as solid organs, or hollow organs. The fixed organs are the liver, pancreas, spleen, kidneys and adrenal glands. The hollow organs of the abdomen are the stomach, intestine, gallbladder, bladder and rectum.

The number of organs in each organism depends on the definition used. By one widely accepted definition, 79 organs have been identified in the human body.

Apart from placozoans, multicellular animals including humans have a variety of organ systems. These specific systems are widely studied in human anatomy. The functions of these organ systems often share significant overlap. For example, the nervous system and the endocrine system both work through a shared organ, the hypothalamus. For this reason, the two systems are combined and studied as the neurodocrine system. The same applies to the musculoskeletal system because of the relationship between the muscles and skeletal systems.

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In the study of anatomy, viscera (singular viscus) refers to the internal organs of the abdominal, thoracic and pelvic cavities.

The abdominal organs can be classified as solid organs, or hollow organs. The solid organs include the liver, pancreas, spleen, kidneys and adrenal glands. The hollow organs include the stomach, intestines, gallbladder, bladder and rectum.

The term “visceral” is contrasted with the term “parietal”, which means “of or relating to the wall of a body part, organ or cavity”

The two terms are often used when describing a membrane or piece of connective tissue, referring to the opposite sides.

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Relationship of large animal lineages with indication of how long ago these animals shared a common ancestor. On the left, important organs can be seen, allowing us to determine how long ago these evolved.

The organ level of organization in animals can first be discovered in flatworms and the more derived phyla, i.e. the bilaterians. The less advanced taxa (i.e. Placozoa, Porifera, Ctophora and Cnidaria) do not show consolidation of their tissues into organs.

More complex animals are composed of different organs, which have evolved over time. For example, the liver and the heart evolved in the chordates about 550-500 million years ago, while the gut and brain are even more ancient, originating in the ancestor of vertebrates, insects, molluscs, and worms about 700- 650 million years ago.

Given the ancite origin of most vertebrate organs, researchers have looked for model systems, where organs have evolved more accurately, and ideally have evolved multiple times independently. An excellent model for this type of research is the placta, which has evolved more than 100 times independently in vertebrates, has evolved relatively straight in some lineages and exists in intermediate forms in existing taxa.

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Studies on the evolution of the placta have identified a variety of genetic and physiological processes that contribute to the origin and evolution of organs, which include the reorganization of existing animal tissues, the acquisition of new functional properties by these tissues, and novel interactions of distinct tissue types.

The flower is the reproductive organ of the angiosperm. This Hibiscus flower is hermaphroditic, and it contains stem and pistils.

The study of plant organs is covered in plant morphology. Organs of plants can be divided into vegetative and reproductive. Vegetative plant organs include roots, stems and leaves. The reproductive organs are variable. In flowering plants they are represented by the flower, seed and fruit.

In conifers, the organ that carries the reproductive structures is called a cone. In other divisions ​​​​​​(phyla) of plants, the reproductive organs are called strobili, in Lycopodiophyta, or simply gametophores in moss. Common organ system designations in plants include shoot and root differentiation. All parts of the plant above the ground (in the case of non-epiphytes), including the functionally distinct leaf and flower organs, can be classified together as the shoot organ system.

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The vegetative organs are essential for maintaining the life of a plant. While there may be 11 organ systems in animals, there are far fewer in plants, where some perform the vital functions such as photosynthesis, while the reproductive organs are essential in reproduction. However, if there is asexual vegetative reproduction, the vegetative organs are what make the new generation of plants (see clonal colony).

Many societies have a system of organ donation, where the organ from a living or deceased donor is transplanted into a person with a failing organ. The transplantation of larger solid organs often requires immunosuppression to prevent organ rejection or graft-versus-host disease.

Organ transplants began to take place when scientists knew more about the anatomy of organs. These came later, as procedures were often dangerous and difficult.

Both the source and method of obtaining the organ to be transplanted are major ethical issues to consider, and since organs or resources for transplant are always more limited than the demand for them, different concepts of justice, including distributive justice, are , developed in the ethical analysis. This situation will continue as long as transplantation relies on organ donors instead of technological innovation, testing and industrial manufacturing.

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The glish word “organ” dates from the twelfth period and refers to any musical instrument. By the late 14th century, the meaning of the musical term had been narrowed to refer specifically to the keyboard-based instrument. At the same time, a second meaning arose, in reference to a “body part adapted to a certain function”.

Plant organs are made of tissue consisting of different types of tissue. The three tissue types are ground, vascular and dermal.

The adjective visceral, also splanchnic, is used for everything related to the internal organs. Historically, entrails of animals were examined by Roman pagan priests such as the haruspices or the augurs to divine the future by their shape, dimensions or other factors.

Aristotle often used the word in his philosophy, both to describe the organs of plants or animals (eg logical works, branch as a whole, are referred to as the Organon).

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Some alchemists (e.g. Paracelsus) adopted the Hermetic Qabalah allocation between the seven vital organs and the seven classical planets as follows:

Chinese traditional medicine recognizes elevator organs, associated with the five Chinese traditional elemts and with yin and yang, as follows:

The Chinese associated the five elements with the five planets (Jupiter, Mars, Vus, Saturn and Mercury) similar to the way in which the classical planets were associated with different metals. The yin and yang distinction approximates the modern concept of solid and hollow organs.

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