Growth of the kidney is due to the enlargement of existing nephrons not due to an increase in their number. But, since potassium and sodium share the same transport carrier, as potassium is excreted the sodium is retained reabsorbed.
Therefore, since water is left behind and solutes are being removed, the filtrate is now dilute. In a diabetic, the level of glucose is so high that the number of carrier molecules becomes inadequate and glucose remains in the urine.
Since the rate of glomerular filtration is directly related to the hydrostatic blood pressure in glomerular capillaries, any increase in blood pressure results in a corresponding increase in filtration rate and urine output.
It is not until it has lost most of its water, nutrients, and essential ions and is dumped into the collecting ducts that it is truly urine. Useful materials such as nutrients and minerals are also dissolved in plasma and are also present in renal filtrate. Efferent arterioles — carry the newly filtered blood away from the glomerulus.
The GFR determines the stage of chronic renal disease. PhysioEx Exercise 9 former 41B: It consists of a specialized tubular structure and closely associated blood vessels. These cells also secrete substances back into it nitrogenous wastes, ammonium ions.
Renal System Physiology Nephron o The nephron is the structural and functional unit of the kidney. Conversely, drops in blood pressure have the opposite effect. When nephrons are damaged they are not replaced or regenerated. Waste products are dissolved in blood plasma so they pass into the renal filtrate.
Substances secreted into the urine include ammonia, hydrogen ions, potassium and some drugs. Afferent arterioles — feed into the glomerular capillary bed. The glomerular filtration rate GFR is a measurement of how well the kidneys are processing wastes.
These substances are water, glucose, amino acids, vitamins, bicarbonate ions, and the chloride salts of calcium, magnesium, sodium and potassium. The posterior pituitary hormone, antidiuretic hormone ADHis produced by the hypothalamus and released from the posterior pituitary when the osmotic pressure of blood and body fluids increases.
Urine Formation The formation of urine involves three major processes: It consists of water, glucose amino acids, some salts, and urea. Because of the high sodium ion concentration in the kidney interstitial fluids, increasing the number of these pores increases the rate of water reabsorption from the urine back into blood in this distal region of the nephron.
This mechanism also changes the composition of urine. The role of systemic blood pressure in controlling kidney function is obvious. The filtrate does not contain plasma proteins because they are too large to pass through the pores of the capillary membrane so they remain in the blood.
Since this process ultimately decreases blood volume, the kidneys are a powerful means of controlling long term blood pressure.
Narrower diameter than the afferent vessels keeps glomerular pressure high. The glomerular capillaries are located between the afferent and efferent arterioles.
Study Exercise 41B: Renal System Physiology - Computer Simulation flashcards taken from the book Human Anatomy & Physiology Laboratory Manual.
What are two primary functions of the kidney? excrete excess water and regulate plasma osmolarity, plasma volume, body's acid-base volume and the body's electrolyte balance.
Starting at the renal corpuscle, list the components of the renal tubule as they are encountered by filtrate.
Solved PhysioEx Exercise 9 Renal System Physiology Anatomy and Physiology 4 years ago hafranklin20 padre 1 Reply Views This topic is currently locked from adding new posts.
Ex 41B: Renal Physiology – The Function of the Nephron: Computer Simulation Physioex Data Sheet Would kidney function as a whole be affected if a single nephron was blocked? Explain Microsoft Word - Physioex 41B Created Date.
Use the simulation to determine your answer. 3. What changes are seen in nephron function when the valve is closed? 4. Why were these changes seen? 5. Is the kidney functional when the glomerular filtration rate is zero? Explain your answer. 6. What is the major “ingredient” that needs to be removed from the blood?
7. Use the simulation to determine your answer. 3. What changes are seen in nephron function when the valve is closed? 4. Why were these changes seen? 5. Is the kidney functional when the glomerular filtration rate is zero? Explain your answer. 6. What is the major ingredient that needs to .Physioex renal system simulation ex 41b