what are cell tissues and organs?
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In the human body, cells are the basic units of life. Groups of cells working together for a specific function form tissues. Organs are two or more tissues operating together. Even separate organs work together, forming body systems.
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Tissues are composed of cells and extracellular products. ... Tissues may be categorized into four major types: (1) epithelial, (2) connective tissue, (3) muscle, and (4) nervous tissue. The cells of tissues are held together by one or more of a variety of cell junctions.
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Yet you can turn up the magnification for an even closer look: Cells contain molecules that are made up of even smaller components called atoms. Figure 1: Levels of the body from smallest to largest: Atoms, molecules, cells, tissues, organs, and organ systems.
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Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
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Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive. ... Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
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Tissues are groups of cells that perform a common function, such as skeletal muscle tissue or fat tissue. They are therefore larger than cells. Organisms are made up of organs which are made up of tissues, and are therefore larger than tissues. ... Population, organism, tissue, cell, organelle, molecule.
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Tissues are groups of similar cells that have a common function. The four basic tissue types are epithelial, muscle, connective, and nervous tissue. Each tissue type has a characteristic role in the body: ... Connective tissue supports and protects body organs.
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Identify the four types of tissue in the body, and describe the major functions of each tissue. The four types of tissues in the body are epithelial, connective, muscle, and nervous.
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Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA.
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A tissue is a group of cells with a similar structure and function working together. ... An organ is made up of different types of tissues.
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Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
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Cells are the basic unit of a living organism and where all life processes are carried out. Animal cells and plant cells share the common components of a nucleus, cytoplasm, mitochondria and a cell membrane. Plant cells have three extra components, a vacuole, chloroplast and a cell wall.
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In larger organisms, cells combine to make tissues, which are groups of similar cells carrying out similar or related functions. Organs are collections of tissues grouped together performing a common function. ... An organ system is a higher level of organization that consists of functionally related organs.
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They are therefore smaller than organisms. Tissues are groups of cells that perform a common function, such as skeletal muscle tissue or fat tissue. ... Organisms are made up of organs which are made up of tissues, and are therefore larger than tissues.
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['Epithelial tissue. covers body surfaces; lines body cavities, hollow organs, and ducts (tubes); and forms glands.', 'Connective tissue. ... ', 'Muscular tissue. ... ', 'Nervous tissue. ... ', 'Fibroblasts. ... ', 'Macrophages. ... ', 'Plasma cells. ... ', 'Mast cells.']
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Cells are the basic units of structure and function in the human body, as they are in all living things. Each cell carries out basic life processes that allow the body to survive. Many human cells are specialized in form and function, as shown in Figure below.
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Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.