Brittany Pilcher
Unit 4 Test
Short Answer Questions

Explain the role of the Renin-angiotensin mechanism in its control of blood pressure through the kidneys.
The Renin-Angiotensin-Aldosterone Mechanism: influences blood pressure and blood volume, with its ability to regulate aldosterone, thus meaning it can regulate water and sodium reabsorption by the kidneys. The juxtaglomerular complexes in the kidneys are cells that get excited due to decreasing in blood volume and or blood pressure. The juxtaglomerular cells accommodate by releasing renin into the blood. The renin blocks of part of the angiotensinogen in the plasma proteins, this initiates the formation of angiotensin II, which in turn releases aldosterone by stimulating specific …show more content…
It also triggers thirst, water consumption which ultimately restores blood volume and blood pressure. Angiotensin II also is a vasoconstrictor which also directly raises blood pressure, but without raising blood volume, as your body tires to compensate it …show more content…
Because 1 osmol (equivalent to 1 mole of particles) is a fairly large unit, the milliosmole (mOsm) (Mil”e-oz”mol), equal to 0.001 osmol, is generally used. In the discussion that follows, we use mOsm to indicate mOsm/kg.” Our kidneys control our body fluids solute level by means of controlling urine volume and concentration. You produce small amounts of concentrated urine when your body is in need of conserving water. When your body doesn’t need to conserve water you produce large amounts of dilute urine. This is accomplished by what is called countercurrent mechanisms. This means that fluid will flow in an opposite direction of that of the adjacent segments. This allows the passage of materials to occur between two segments. “two types of countercurrent mechanisms determine urine concentration and volume: The countercurrent multiplier is the interaction between the flow of filtrate thought the ascending and descending limbs of the long nephron loops of juxtamedullary nephrons. The countercurrent exchanger is the flow of blood through the ascending and descending portions of the vasa recta.” This controls and upholds an osmotic gradient. “This gradient the -medullary osmotic gradient- allows the kidneys to vary urine concentration dramatically.” Without this gradients conservation of water while dehydrated wouldn’t be obtainable. ADH also plays an important role in this ADH is what is