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| The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic. |
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| 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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| A part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans. |
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| In biology, an organ system is a group of organs that work together to perform one or more functions. Each does a particular job in the body, and is made up of certain tissues. |
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| An individual animal, plant, or single-celled life form. |
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| A membranous cellular tissue that covers a free surface or lines a tube or cavity of an animal body and serves especially to enclose and protect the other parts of the body, to produce secretions and excretions, and to function in assimilation. |
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| A band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body. |
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| (In the body) a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs. |
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| Tissue that connects, supports, binds, or separates other tissues or organs, typically having relatively few cells embedded in an amorphous matrix, often with collagen or other fibers, and including cartilaginous, fatty, and elastic tissues. |
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| A specialized cell transmitting nerve impulses; a nerve cell |
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| A microscopic organism, especially a bacterium, virus, or fungus. |
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| Muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control. |
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| Muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope. Muscles of this type are attached to the skeleton by tendons and are under voluntary control. |
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| Another term for myocardium which is the muscular tissue of the heart. |
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| Firm, whitish, flexible connective tissue found in various forms in the larynx and respiratory tract, in structures such as the external ear, and in the articulating surfaces of joints. It is more widespread in the infant skeleton, being replaced by bone during growth. |
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| The upper or outer layer of the two main layers of cells that make up the skin. The epidermis is mostly made up of flat, scale-like cells called squamous cells. Under the squamous cells are round cells called basal cells. |
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| A plant that is characterized by the presence of conducting tissue. |
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| Fundamental(plant tissue) |
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| Plant tissue other than dermal and vascular tissues that consists typically of relatively undifferentiated parenchymatous and supportive cells |
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