Kidney From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search For other uses‚ see Kidney (disambiguation). Kidney | | Human kidneys viewed from behind with spine removed | Latin | Ren (Greek: nephros) | Artery | renal artery | Vein | renal vein | Nerve | renal plexus | The kidneys are organs that serve several essential regulatory roles in most animals‚ including vertebrates and some invertebrates. They are essential in the urinary system and also serve homeostatic functions such
Premium Kidney
Primary functions of the kidney: — Maintaining homeostasis through the regulation of fluid and electrolytes and removing wastes through the formation of urine. ž Other important functions: — Regulation of acid-base balance — Control of blood pressure — Renal clearance — Regulation of RBC production — Synthesizing vitamin D to the active form — Secreting prostaglandins — Regulating calcium and phosphorus balance. Nephron ž Each kidney has about 1 million
Free Kidney Nephron Glomerulus
The liver converts excess protein into urea. The kidneys remove unwanted substances such as urea‚ excess water and salt. © Boardworks Ltd 2009 What is urea? Excess amino acids in the body are broken down by the liver‚ producing a waste substance called urea. This process is important because it converts toxic ammonia to urea‚ which is done using carbon dioxide. Once formed‚ urea is transported by the circulatory system to the kidneys. The kidneys filter the blood‚ removing urea and excess water
Premium Chronic kidney disease Immune system Kidney
http://thegrabup.com/?p=811 Significance Of Osmosis (700-1200) Osmosis is a process of movement of solvent through a semi permeable membrane from an area of high water concentration to an area of low water concentration to equalize the concentration of solute to both side of the membrane. . Water is sometimes called "the perfect solvent‚" and living tissue (for example‚ a human being’s cell walls) is the best example of a semipermeable membrane. Osmosis process as demonstrated below shows that when
Premium Food preservation Osmosis
Kidneys * Kidneys maintain the purity and constancy of our in internal fluids. Every day‚ the kidneys filter gallons of fluid from the bloodstream. They then process this filtrate‚ allowing wastes and excess ions to leave the body in urine while returning needed substances to the blood in just the right proportions. Kidneys also regulate the blood’s volume and chemical makeup so that the proper balance between water and salts and between acids and bases is maintained. * The Kidneys alone
Premium Kidney
Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive‚ i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell
Premium Osmosis Cell wall Cell membrane
concentrated area to a low concentrated area. Water is one molecule that can diffuse freely in a cell. Other molecules need assistance through the cell membrane through a process called facilitated diffusion. Osmosis moves from an area of low concentration to high concentration. In osmosis water moves in the opposite way. Water flow is determined by the concentration‚ not the nature of the solute. There are a couple of things to consider for diffusion to work. The size of the cell‚ permeability
Premium Osmosis Diffusion Cell membrane
Osmosis in Plants Outline: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. Definition - Osmosis: Movement of a solvent (liquid) through a semi-permeable membrane separating solutions of different concentrations. The solvent passes from a less concentrated solution to a more concentrated solution until the two concentrations are equal. All
Premium Cell wall Concentration Cell
Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration‚ in the direction that tends to equalize the solute concentrations on the two sides.[1][2][3] It may also be used to describe a physical process in which any solvent moves‚ without input of energy‚[4] across a semipermeable membrane (permeable to the solvent‚ but not the solute) separating two solutions of different concentrations.[5] Although osmosis does
Premium Osmosis
keeping the blood glucose at set point. Picture 1 ( http://www.bio.miami.edu/~cmallery/150/physiol/c45x10glu-homeostasis.jpg) In the homeostatic system many organs have specific roles. The kidney as several roles as a homeostatic organ‚ one of the roles is the regulation of blood PH ‘the kidney excrete a variable amount of hydrogen ions into the urine and conserve bicarbonate ions’ (Principles of human anatomy) as these two activities help regulate the blood PH level. The urogenital system
Free Kidney Nephron Blood