Explain the mechanism how furosemide affects kidney tubules. How does this affect K+ balance? How different is the mechanism of thiazide affect urine production? Describe the process of acid-base regulation in human body.
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Explain the mechanism how furosemide affects kidney tubules. How does this affect K+ balance? How different is the mechanism of thiazide affect urine production? Describe the process of acid-base regulation in human body.
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- Renin is secreted in response to hypovolemia or to an increase in the osmolality of the blood. Provide three possible mechanisms by which these conditions may stimulate rennin secretion. What are the consequences of increased rennin secretion that lead to increased aldosterone secretion? Present this sequence of events. Why are angiotensin converting enzyme inhibitors (ACEIs) used as a common therapy for hypertension? How do they influence blood pressure? Are plasma levels of renin elevated or depressed in a patient with Conn’s disease? Why?One type of diuretic given to people with high blood pressure, renal disease and congestive heart failure are thiazide-type diuretics. These drugs inhibit sodium ion reabsorption by inhibiting the transport in the ascending limb of the loop of Henle. A) What does it mean to inhibit the transport of sodium ions in the loop of Henle? B) Explain how this inhibition of sodium ions in the loop of Henle could help increase urine production.The Na+-glucose transporters SGLT2 and SGLT1 are located at different levels of the kidney proximal tubule to minimize spillover of the glucose into the urine (See diagram attached) a) Consider the Na+-glucose coupling ratios for SGLT2 and SGLT1. Why would localization of SGLT2 in the early proximal tubule and SGLT1 in the late proximal tubule be advantageous? b) The Michaelis constant (Km) for the SGLT2 and SGLT1 transporters are 2 mM and 0.5 mM, respectively. Is SGLT2 or SGLT1 the higher affinity Na+-glucose transporter? d) Dapagliflozin is an SGLT1 inhibitor and commonly prescribed to treat type 2 diabetes. Why would this be of benefit to a diabetes patient?
- How does moderate to severe COPD (chronic obstructive pulmonary disease) often lead to chronic respiratory acidosis? How might the kidneys compensate for this i.e explain at least 2 mechanisms which the kidney may use to do so - be sure to include hormones, cells involved. If the H+/K+ ATPase is brought into service, how would the plasma K+ concentration be affected? Lastly, how would activation of H+/K+ ATPase counteract or synergize with the actions of aldosterone?Why do women recieving oxytocin (to facilitate childbirth) become edematous? In the early days of oxytocin therapy, when this effect was not recognized, some women died of water intoxication. Explain.Consider the effect of a twofold increase in the ECF concentration of Na+ or K+ ions. Which increase in ion concentration is the more deadly and why?
- Given: A patient’s GFR (glomerular filtration rate) is 125 ml/min, and his urine is produced at a rate of 1.25 ml/min. (A) By what factor is the inulin concentrate in his urine. (B) The concentration of glucose in his plasma is 5 mmol/l. His renal reabsorption of glucose is completely inhibited. What would be the concentration of glucose in his urine? (answer parts a and b)(a) Identify the two reactions that allow the kidney to produce NH4+. (b) Which gluconeogenic precursor is thereby generated? Describe thepathway by which it can be converted to glucose.Spironolactone is a widely prescribed diuretic ("water pill" - make you pee) which works by acting as an antagonist to aldosterone thus blocking its actions. Knowing this, how does spironolactone work as an antihypertensive (lower BP) and as a "potassium-sparing" diuretic?
- Describe in detail the role of kidneys in acid-base regulation.Explain the mechanism by which allopurinol can prevent excess uric acid formation.A. Maintenance of fluid balance is important for the survival of humans. How does antidiuretic hormone and aldosterone contributes to the maintenance of fluid balance?(ii) High blood pressure can result from increased sodium concentration of plasma. What is the main hormone involved in regulation of sodium and how does it affect the sodium content of blood?(iii) Compare intracellular fluid to extracellular fluid in terms of their chemical composition of proteins, sodium and potassium.(b) Explain the morphological changes that will occur and the driving force when red blood cells are place in (i) 2.0 % sodium chloride solution (ii) 0.9 % sodium chloride solution (iii) 0.01 % sodium chloride solution 1. What are the 4 causes of subarachnoid hemorrhage? 2. State the factors involved in congenital berry or saccular aneurysm 3. Mention 5 specific brain tumors that you know. 4. What is dura mater, arachnoid matter and pia matter? 5. What is meningioma 6. What is acute subdural hematoma 7.…