When the level of Atrial Natriuretic Peptide (ANP) increases a. more urine is pr

Question

When the level of Atrial Natriuretic Peptide (ANP) increases a. more urine is produced b. less urine is produced c. less water is reabsorbed by the nephron and collecting duct d. the specific gravity of the urine Increases 32. 33-39 Base your answers for Questions 33-39 on the Diagrams below 33. This Figure would result in an Increase in GFR 34. This Figure would result in a Drop in Blood Pressure 35. This Figure would result from the action of Paracrines released by the Macula Densa 36. This Figure would result in an Increase in Blood Pressure 37. This Figure shows a constriction of the Afferent Blood Arteriole 38. This Figure shows a constriction of the Efferent Arteriole 39. This Figure would result in a Decrease in GFR 40-44 Base your answers on the Diagram of the Nephron below 40. ADH allows facultative water reabsorption to occur here 41. Obligatory water and most Na reabsorption occurs here 42. Aldosterone mediated transcription result in Na reabsorption and K secretion here 43. Filtration occurs here 44. Here half of the water and two-thirds of the sodium and chloride ions remaining in the tubular fluid are reabsorbed

Explanation / Answer

32.

Atrial natriuretic peptide (ANP) is a polypeptide hormone produced by heart muscle cells. It is involved in reduction of increased extracellular fluid (ECF) volume by increasing renal sodium excretion. The increase of ANP dilates the glomerular afferent arteriole and constriction of efferent arteriole resulting in more urine and salt production. Option a is correct.

33. The figure B results in increased GFR because of dilation of afferent arteriole that increases the blood flow reducing the blood pressure.

34. The figure B results in drop in blood pressure due to dilation of afferent arteriole increasing the blood flow and increases GFR.

35. The figure B results in paracrine stimulation due to effect of macua densa cells of afferent arteriole due to dilation of afferent arteriole and drops the blood pressure by increasing the blood flow and increases GFR.

36. The figure A results in increased blood pressure due to constriction of afferent arteriole.

37. The figure A shows constriction of afferent arteriole and results in increased blood pressure .

38. Neither figure A nor figure B are showing constriction of efferent arteriole.

39. The figure A shows constriction of afferent arteriole and causes increased blood pressure resulting in decreased GFR. .

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