Tissues

The human body as well as that of other animals (Species) is highly structured into organs and tissues which serve specific functions. Tissue is the organizational level intermediate between cells and organs system which compose the whole organism. All the tissues and cell types defined in an animal organism are hierarchical structured and shall be fully described. o

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  • name description synonyms
    heart 1: A hollow muscular organ of vertebrate animals that by its rhythmic contraction acts as a force pump maintaining the circulation of the blood.n2: A structure in an invertebrate animal functionally analogous to the vertebrate heart [Brenda].
    trachea 1: The cartilaginous and membranous tube descending from the larynx and branching into the right and left main bronchi. It is kept patent by a series of about twenty transverse horseshoe-shaped cartilages. Called also windpipe.n2: One of a system of minute tubes ramifying throughout the body of a terrestrial arthropod and delivering air to the tissues. Called also tracheal tubule [Brenda].
    blood 1: The fluid that circulates in the heart, arteries, capillaries, and veins of a vertebrate animal carrying nourishment and oxygen to and bringing away waste products from all parts of the body.n2: A comparable fluid of an invertebrate [Brenda].
    abdomen 1: The part of the body between the thorax and the pelvis; also: the cavity of this part of the trunk containing the chief viscera.n2: The posterior section of the body behind the thorax in an arthropod [Brenda].
    thorax 1: The part of the mammalian body between the neck and the abdomen; also: its cavity in which the heart and lungs lie.n2: The middle of the three chief divisions of the body of an insect; also: the corresponding part of a crustacean or an arachnid [Brenda].
    nose 1a: The part of the face that bears the nostrils and covers the anterior part of the nasal cavity; broadly: this part together with the nasal cavity.n1b: The anterior part of the head at the top or end of the muzzle: snout, proboscis.n2: The vertebrate olfactory organ [Brenda].
    muscle A body tissue consisting of long cells that contract when stimulated and produce motion [Brenda].
    capillary A capillary tube; especially: any of the smallest blood vessels connecting arterioles with venules and forming networks throughout the body [Brenda].
    lymph A clear, watery, sometimes faintly yellowish fluid derived from body tissues that contains white blood cells and circulates throughout the lymphatic system, returning to the venous bloodstream through the thoracic duct. Lymph acts to remove bacteria and certain proteins from the tissues, transport fat from the small intestine, and supply mature lymphocytes to the blood [Brenda].
    stomach A dilatation of the alimentary canal of a vertebrate communicating anteriorly with the esophagus and posteriorly with the duodenum [Brenda].
    fibroblasts A fibroblast is a type of cell that synthesizes the extracellular matrix and collagen, the structural framework (stroma) for animal tissues, and plays a critical role in wound healing. Fibroblasts are the most common cells of connective tissue in animals [Wikipedia: http://en.wikipedia.org/wiki/Fibroblast].
    thymus A glandular structure of largely lymphoid tissue that functions especially in the development of the body's immune system, is present in the young of most vertebrates typically in the upper anterior chest or at the base of the neck, and tends to atrophy in the adult [Brenda].
    neutrophil A granulocyte that is the chief phagocytic white blood cell of the blood [Brenda].
    spleen A highly vascular ductless organ that is located in the left abdominal region near the stomach or intestine of most vertebrates and is concerned with final destruction of red blood cells, filtration and storage of blood, and production of lymphocytes [Brenda].
    natural killer cell A large granular lymphocyte capable of killing a tumor or microbial cell without prior exposure to the target cell and without having it presented with or marked by a histocompatibility antigen [Brenda].
    pancreas A large lobulated gland of vertebrates that secretes digestive enzymes and the hormones insulin and glucagon [Brenda].
    lymphocytes A lymphocyte is a type of white blood cell in the vertebrate immune system [Wikipedia: http://en.wikipedia.org/wiki/Lymphocyte].
    mucosa A membrane lining all body passages that communicate with the air, such as the respiratory and alimentary tracts, and having cells and associated glands that secrete mucus [Brenda].
    naive T cell A naive T cell or Th0 cell is a T cell that has differentiated in bone marrow, and successfully undergone the positive and negative processes of central selection in the thymus. A naive T cell is considered mature and unlike activated T cells or memory T cells it has not encountered its cognate antigen within the periphery [Wikipedia: http://en.wikipedia.org/wiki/Naive_T_cell].
    fascia A sheet of connective tissue covering or binding together body structures as muscles [Brenda].
    omentum A sheet of fat that is covered by peritoneum. The greater omentum is attached to the bottom edge of the stomach, and hangs down in front of the intestines. Its other edge is attached to the transverse colon. The lesser omentum is attached to the top edge of the stomach, and extends to the undersurface of the liver [Omentum: http://www.medterms.com/script/main/art.asp?articlekey=4632].
    pineal gland A small, cone-shaped organ in the brain of most vertebrates that secretes the hormone melatonin [Brenda].
    dendritic cell A special type of cell that is a key regulator of the immune system, acting as a professional antigen-presenting cell, APC, capable of activating naive T cells and stimulating the growth and differentiation of B cells. Dendritic cells are found, for example, in the lymph nodes and spleen. As an APC, a dendritic cell can retain antigen for long periods on its surface, present the antigen to a T or B cell and so influence their behavior [Brenda].
    cartilage A specialized, fibrous connective tissue, forming most of the temporary skeleton of the embryo, providing a model in which most of the bones develop, and constituting an important part of the growth mechanism of the organism. It exists in several types, the most important of which are hyaline cartilage, elastic cartilage, and fibrocartilage. Also used as a general term to designate a mass of such tissue in a particular site in the body [Brenda].
    tendon A tough cord or band of dense white fibrous connective tissue that unites a muscle with some other part (as a bone) and transmits the force which the muscle exerts [Brenda].
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