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excretion is the biological process by which organism remove harmful metabolic waste from the body. the mode of excretion is completely different in unicellular and multicellular organisms.
excretion in human beings
the main function of human excretory system is to remove the nitrogenous wastes such as urea from the body. it includes a pair of Kidneys a pair of ureters a urinary bladder and a urethra.
Kidneys are located in the abdomen one on
either side of the backbone.
the purpose of making urine is to filter out waste products from the blood. these wastes are removed from the blood by Kidneys and are passed down to the urinary bladder by the pair of ureters. the urethra father carries the urine out of the body. the phenomenon of discharging urine to outside is called urination.
nephron: each kidney is made up of thousands of tiny tubles called nephron. nephron is the structural and functional unit of kidney. blood at high pressure travels into these tubles why blood capillaries called glomerulus, which are surrounded by a Cup shaped capsule called bowman's capsule.
excretion in human beings
the main function of human excretory system is to remove the nitrogenous wastes such as urea from the body. it includes a pair of Kidneys a pair of ureters a urinary bladder and a urethra.
Kidneys are located in the abdomen one on
either side of the backbone.
the purpose of making urine is to filter out waste products from the blood. these wastes are removed from the blood by Kidneys and are passed down to the urinary bladder by the pair of ureters. the urethra father carries the urine out of the body. the phenomenon of discharging urine to outside is called urination.
nephron: each kidney is made up of thousands of tiny tubles called nephron. nephron is the structural and functional unit of kidney. blood at high pressure travels into these tubles why blood capillaries called glomerulus, which are surrounded by a Cup shaped capsule called bowman's capsule.
KannAnuragh:
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Excretion is a process by which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin.[1] This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life. For example, in mammals urine is expelled through the urethra, which is part of the excretory system. In unicellular organisms, waste products are discharged directly through the surface of the cell.
During life activities such as cellular respiration, several chemical reactions take place in the body. These are known as metabolism. These chemical reactions produce waste products such as carbon dioxide, water, salts, urea and uric acid. Accumulation of these wastes beyond a level inside the body is harmful to the body. The excretory organs remove these wastes. This process of removal of metabolic waste from the body is known as excretion.
Green plants produce carbon dioxide and water as respiratory products. In green plants, the carbon dioxide released during respiration gets utilized during photosynthesis. Oxygen is a by product generated during photosynthesis, and exits through stomata, root cell walls, and other routes. Plants can get rid of excess water by transpiration and guttation. It has been shown that the leaf acts as an 'excretophore' and, in addition to being a primary organ of photosynthesis, is also used as a method of excreting toxic wastes via diffusion. Other waste materials that are exuded by some plants — resin, saps, latex, etc. are forced from the interior of the plant by hydrostatic pressures inside the plant and by absorptive forces of plant cells. These latter processes do not need added energy, they act passively. However, during the pre-abscission phase, the metabolic levels of a leaf are high.[2][3] Plants also excrete some waste substances into the soil around them.[4]
Chemical structure of uric acid.
During life activities such as cellular respiration, several chemical reactions take place in the body. These are known as metabolism. These chemical reactions produce waste products such as carbon dioxide, water, salts, urea and uric acid. Accumulation of these wastes beyond a level inside the body is harmful to the body. The excretory organs remove these wastes. This process of removal of metabolic waste from the body is known as excretion.
Green plants produce carbon dioxide and water as respiratory products. In green plants, the carbon dioxide released during respiration gets utilized during photosynthesis. Oxygen is a by product generated during photosynthesis, and exits through stomata, root cell walls, and other routes. Plants can get rid of excess water by transpiration and guttation. It has been shown that the leaf acts as an 'excretophore' and, in addition to being a primary organ of photosynthesis, is also used as a method of excreting toxic wastes via diffusion. Other waste materials that are exuded by some plants — resin, saps, latex, etc. are forced from the interior of the plant by hydrostatic pressures inside the plant and by absorptive forces of plant cells. These latter processes do not need added energy, they act passively. However, during the pre-abscission phase, the metabolic levels of a leaf are high.[2][3] Plants also excrete some waste substances into the soil around them.[4]
Chemical structure of uric acid.
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