what is the composition and function of individual tissues?
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It all depends on the location of the tissue and what organ it functions on.
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Nitrogen is the key element which gives proteins their functionality. The body needs proteins to build and repair tissues. Animals get these proteins from plants who get it from the air. The nitrogen in the air also keeps us from bursting due to excessive respiration.
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G'day Joanne F,\n\nThank you for your question.\n\nIt is essential if you are studying medicine to have a good understanding of how cells and tissues work. It is also useful to know how particular cells such as blood cells work.\n\nRegards
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In biology, an organ (Latin: organum, "instrument, tool") is a group of tissues that perform a specific function or group of functions. Usually there is a main tissue and sporadic tissues. The main tissue is the one that is unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are the nervous, blood, connective etc. (Wikipedia.org)\n\nIn zootomy and dermatology, skin is an organ of the integumentary system made up of multiple layers of epithelial tissues that guard underlying muscles and organs. As the interface with the surroundings, it plays the most important role in protecting against pathogens. Its other main functions are insulation and temperature regulation, sensation and vitamin D and B synthesis. Skin is considered one of the most important parts of the body.(Wikipedia.org)\n\nPretty much the skin is considered an organ because it is a group of tissues speciallizing in a certain task / tasks. For example the skin regulates temperature by using the sweat glands to produce sweat - sweat evaporates and cools the body.
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organ: brain\nmolecule: DNA
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Hi there !\nWhat do you mean by the question ? \nYou expect somebody to describe the "entire digestion" and the "metabolism mechanism" of the Human body in this column ?\nBetter verify the "Book of Physiology by Guyton" or "Chatterjee"..they have given beautiful descriptions ! \nbest wishes !
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cell-tissue-organ-organ systems-organism (population)\nTissues are a group of specialized cells that perform a function. Organs are groups of specialized tissues that perform an even more complex function. Organ systems are groups of organs that perform a function in a series of complex, yet related steps. An organism is a body with  several organ systems necessary to maintain homeostasis. This can be extended to population which is several organisms existing together to survive (think food webs).\n\nUnicellular organisms do not have specialized cells. They have only one cell to perform all the functions it needs.
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Each cell in the human body contains thousands of different proteins, the most abundant and diverse class of biomolecules. Proteins are, in fact, present in the cells of all living organisms, though each different species contains a slight to major variation in the number and type of the biomolecules so that there are literally millions of different proteins that exist in the biological world. Proteins play a major role both in cellular structure and function, some being involved in such activities as transport, catalysis, storage, contraction, and protection, while others form critical parts of the cytoskeleton. The types of protein differ from cell to cell, but all have the same basic structure with respect to the constituent amino acids that make up the backbone. Most proteins are biological macromolecules that range in molecular weight from about 6,000 to several million Daltons. They are all polymers that are composed of covalently linked amino acids. The number, chemical nature, and sequential order of amino acids in a protein chain determine the distinctive structure and characteristic chemical behavior of each protein.\n\nAs for order of quantities:\n ~25% of the proteins found in the body are classified as collagens. Followed by keratins, the muscle proteins actin and myosin then hemoglobin.
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Assuming you're talking about a human being; but should be applicable to all animals containing such organs:\n\nFor existence in general; the heart, as the body can 'live' without a functioning brain or liver for a while.\n\nThen the liver, since eventually the body would poison itself.\n\nThen the brain.\n\nHowever, if you're talking about complete 'removal', you need to define the brain. Are you speaking of the cerebral cortex alone or the whole thing? In the latter case, the heart and brain are equivelent since the lower brain stem controls heart rate (as well as other vital; functions,) and without either, neither would function and the body would die within minutes.
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muscles provide both support and functionality. Muscles pull ang push on bones so that they may work. Digestive system digests food and provides energy supply and calcium deposits. Circulatory system transports essential nutrients into bones. Nervous system regulates the action of the bones whether to move or not. Endocrine system parathyroid gland regulates bone formation and bone breakdown. Integumentary system protects bone and muscle from outside environment. Respiratory system brings oxygen
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each organ performs a specific function for the organism, just like organelles perform a specific function for the cell.  hence organelle, "little organ."
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The heart is what pumps blood throughout the body, keeping all organs functioning. Blood flows to the body through arteries and blood flows back to the heart through veins. Its all one big system - the circulatory system.
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A. Tissue linings of the respiratory system
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Most tissues in the human body contain differentiated cells that actually perform the function of the tissue and a population of undifferentiated cells that can take over some part of the function of that tissue should it be damaged. For this reason, many human tissues, such as liver, skin, and skeletal muscle tissue, are capable of repairing themselves if sufficient healthy tissue remains to replace the damaged parts.\n\nOther tissues seem to lack a population of undifferentiated cells (at least in adults) and generally do not regenerate. Tissues in this category include heart muscle, nerve tissue, and kidneys. So, among the cells that are least likely to be replaced by other cells in the human body are cardiac muscle cells, neurons, and the cells that make up the nephrons.
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probably one-epidermis.The skin is made up of the following layers, with each layer performing specific functions:\n\nepidermis \ndermis \nfat layer \nepidermis The epidermis is the thin outer layer of the skin. The epidermis itself is made up of three sub-layers: \nstatus corneum (horny layer)\nThis layer contains continually shedding, dead keratinocytes (the primary cell type of the epidermis). The keratin, a protein formed from the dead cells, protects the skin from harmful substances. \nkeratinocytes (squamous cells)\nThis layer contains living keratinocytes (squamous cells), which help provide the skin with what it needs to protect the rest of the body. \nbasal layer\nThe basal layer is the inner layer of the epidermis, containing basal cells. Basal cells continually divide, forming new keratinocytes and replacing the old ones that are shed from the skin's surface. \nThe epidermis also contains melanocytes, which are cells that produce melanin (skin pigment).\n \ndermis The dermis is the middle layer of the skin. The dermis is made up of the following: \nblood vessels \nlymph vessels \nhair follicles \nsweat glands \nThe dermis is held together by a protein called collagen, made by fibroblasts (skin cells that give the skin its strength and resilience). This layer also contains pain and touch receptors.\n \nsubcutis The subcutis is the deepest layer of skin and is also known as the subcutaneous layer. The subcutis, consisting of a network of collagen and fat cells, helps conserve the body's heat while protecting other organs from injury by acting as a "shock absorber."
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Human cells and animal cells are very similar. Actually, human cells are types of animal cells. Every different tissue in your body is made up of different kinds of cells. They may have different structures, especially in their cell membrane, which make the function of that cell different. Therefore they do have similar functions, depending on their structure and characters.
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there are many kinds of elements and compounds in human body such as blood circulation, repiratory system,muscular system and productive system etc. for an example the function of the blood circulation is to circulate the blood to the whole body . the blood have a pigmen called hemoglobyn to bring along oxygen to the cell in our body. every cell need an oxygen to live. \n\nfurthemore ,our body is contain by many things such as leucosyte , good bacteria , ions , platlet , enzym , hormon , water , uric acid , vitamins, etc. each of this element have their function.