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Selective reabsorption is the process whereby certain molecules (e.g. ions, glucose and amino acids), after being filtered out of the capillaries along with nitrogenous waste products (i.e. urea) and water in the glomerulus, are reabsorbed from the filtrate as they pass through the nephron. [1]
Renal glucose reabsorption is the part of kidney (renal) physiology that deals with the retrieval of filtered glucose, preventing it from disappearing from the body through the urine. If glucose is not reabsorbed by the kidney, it appears in the urine, in a condition known as glycosuria .
Further modification of ultrafiltrate, by reabsorption and secretion, transforms it into urine. Glomerular pressure is about 75 millimeters of mercury (10 kPa ). It is opposed by osmotic pressure (30 mmHg, 4.0 kPa) and hydrostatic pressure (20 mmHg, 2.7 kPa) of solutes present in capsular space.
Fig.3) Secretion and reabsorption of various substances throughout the nephron. The nephron uses four mechanisms to convert blood into urine: filtration, reabsorption, secretion, and excretion. [5]: 395–396 These apply to numerous substances. The structure and function of the epithelial cells lining the lumen change during the course of the ...
Reabsorption allows many useful solutes (primarily glucose and amino acids), salts and water that have passed through Bowman's capsule, to return to the circulation. These solutes are reabsorbed isotonically , in that the osmotic potential of the fluid leaving the proximal convoluted tubule is the same as that of the initial glomerular filtrate.
SSRIs, which first came onto the market in the 1980s, work by blocking the reabsorption of serotonin into your brain. This increases the levels of serotonin on hand and can lessen anxiety symptoms.
The electrical and concentration gradient drives more reabsorption of Na +, as well as other cations such as magnesium (Mg 2+) and calcium (Ca 2+). Cortical thick ascending limb; The cortical thick ascending limb drains urine into the distal convoluted tubule. [3] The tissue type of the loop is simple squamous epithelium.
Selective reabsorption of useful molecules by the canal cells occurs as the solutes pass down the tubule. Protonephridia are generally found in basal organisms such as flatworms. Protonephridia likely first arose as a way to cope with a hypotonic environment by removing excess water from the organism (osmoregulation). Their use as excretory and ...