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The sodium–potassium pump (sodium–potassium adenosine triphosphatase, also known as Na + /K +-ATPase, Na + /K + pump, or sodium–potassium ATPase) is an enzyme (an electrogenic transmembrane ATPase) found in the membrane of all animal cells. It performs several functions in cell physiology.
A simple means of estimating renal function is to measure pH, blood urea nitrogen, creatinine, and basic electrolytes (including sodium, potassium, chloride, and bicarbonate). As the kidney is the most important organ in controlling these values, any derangement in these values could suggest renal impairment.
Acting on the nuclear mineralocorticoid receptors (MR) within the principal cells of the distal tubule and the collecting duct of the kidney nephron, it upregulates and activates the basolateral Na + /K + pumps, which pumps three sodium ions out of the cell, into the interstitial fluid and two potassium ions into the cell from the interstitial ...
Sodium and potassium levels are controlled by secreting K + and absorbing Na +. Sodium absorption by the distal tubule is mediated by the hormone aldosterone. Aldosterone increases sodium reabsorption. Sodium and chloride (salt) reabsorption is also mediated by a group of kinases called WNK kinases.
The Na–K–Cl cotransporter (NKCC) is a transport protein that aids in the secondary active transport of sodium, potassium, and chloride into cells. [1] In humans there are two isoforms of this membrane transport protein , NKCC1 and NKCC2 , encoded by two different genes ( SLC12A2 and SLC12A1 respectively).
The co-transport sodium-potassium pump actively transports sodium out of the PCT (proximal convoluted tubule) wall (using energy from converting ATP to ADP + Pi) to maintain a low Na + concentration gradient in the wall. This low concentration gradient means that Na + ions from the glomerulus filtrate can easily passively diffuse into the wall ...
According to the American Heart Association, adequate potassium intake lessens the potential blood-pressure-raising effects of excess sodium. Specifically, potassium prompts your kidneys to remove ...
This blood is flowing, so the gradient is maintained. Lastly, sodium/potassium ion active transport pumps remove sodium from the tubule wall and the sodium is put back into the blood. This maintains a sodium concentration gradient in the proximal tubule lining, so the first step continues to happen.