if you were to measure the PH of chyme in the duodenum and found it to be between 7 and 8, would this promote, or delay further emptying ofgastric contents?
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if you were to measure the PH of chyme in the duodenum and found it to be between 7 and 8, would this promote, or delay further emptying ofgastric contents?
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- Given: For urea, the rate of excretion equals to the GFR times the urea concentration in plasma. (A) If the urea concentration in plasma is 4.5 mmol/l, what GFR (in l/day) would correspond to an excretion rate of 450 mmol/day. (B) If the urea clearance is 70 ml/min and the GFR is 125 ml/min, what fraction of urea is being reabsorbed. (answer A and B)Gastric juice is made up of substances secreted from parietal cells, chief cells, and mucous‑secreting cells. The cells secrete HClHCl, proteolytic enzyme zymogens, mucin, and intrinsic factor. The pH of gastric juice is acidic, between 1–3. If the pHpH of gastric juice is 1.3, what is the amount of energy (Δ?)(ΔG) required for the transport of hydrogen ions from a cell (internal pH of 7.4) into the stomach lumen? Assume that the potential difference across the membrane separating the cell and the interior of the stomach is −60.0 mV−60.0 mV (inside of the cell is negative relative to the lumen of the stomach). Assume that the temperature is 37 °C. The Faraday constant is 96.5 kJ/(V⋅mol)96.5 kJ/(V⋅mol) and the gas constant is 8.314×10−3 kJ/(mol⋅K)8.314×10−3 kJ/(mol⋅K). Express your answer in kilojoules per mole.The intense acidification observed in the stomach lumen is energetically driven by a parietal cell isozyme of carbonic anhydrase an H+ ATPase the pumps H+ from the parietal cell into the lumen the large gradient of Cl- ion in the plasma that allows movement of H+ into the lumen an OH- transporting ATPase that removes this ion from the lumen, causing a drop in pH
- Why would lipoid acid deficiency lead to metabolic acidosis in a human?Explain why a slight increase in blood pH may occur following a heavy meal. The elevated pH of blood, especially in the veins that carry blood away from the stomach, is called the post enteric alkaline tide.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?
- Renal tubule cells acidify the urine and parietal cells acidify the stomach contents. In each case (a) which intracellular enzyme is key, and (b) blood concentration of which ion increases?Transport of glucose across the basolateral membrane of intestinal epithelial cells and into the vascular system requires which of the following conditions to occur? Select one: a. Sodium concentration on the inside of the epithelial cell is equal to that outside the basolateral membrane b. Sodium concentration is higher on the inside of the epithelial cell than on the outside of the basolateral membrane c. Sodium concentration inside the epithelial cell is lower than sodium concentration in the intestinal lumen d. Sodium concentration inside the epithelial cell is higher than that sodium concentration in the intestinal lumenIn which of the following processes does theentropy increase? In each case, explain why it does or does notincrease.(a) A bottle of ammonia is opened. The odor of ammonia is soonapparent throughout the room.(b) Sodium chloride dissolves in water.(c) A protein is completely hydrolyzed to the component aminoacids.
- African lungfish, which are often found in small stagnant poolsof fresh water, produce urea as a nitrogenous waste. What is theadvantage of this adaptation?(A) Urea takes less energy to synthesize than ammonia.(B) Small stagnant pools do not provide enough water to diluteammonia, which is toxic.(C) Urea forms an insoluble precipitate.(D) Urea makes lungfish tissue hypoosmotic to the pooDiabetic ketoacidosis is characterized by an increased level of ketone bodies, which causes metabolic acidosis. A patient in diabetic ketoacidosis will have an altered rate of ventilation. Will the patient be hyperventilating or hypoventilating? How will a change in the rate and depth of ventilation compensate for an acidosis that is metabolic in nature?Two of the body’s important fluid compartments are those of the interstitial fluid and plasma. How does the liver’s production of plasma proteins interact with those compartments to illustrate the general principle of physiology, Controlled exchange of materials occurs between compartments and across cellular membranes?
