Bio 253 final exam Latest Update Graded A+

Bio 253 final exam Latest Update Graded A+ Organs of the Urinary system kidneys, ureters, urinary bladder, urethra functional unit of the kidney nephron 1 million per kidney! What parts make up the nephron? Renal corpuscle Renal tubule Glomerulus (capillaries that filter the blood plasma) Bowman's capsule (surrounds the glomerulus) Efferent arteriole loop of henle What is the glomerulus made of? capillaries Function of a nephron filter blood and produce urine Two nephron types juxtamedullary and cortical juxtamedullary nephrons -Long nephron loops deeply invade medulla -Ascending limbs have thick and thin segments -Important in production of concentrated urine -found at the boundary of the cortex and medulla cortical nephrons -85% of all nephrons -short nephron loops -efferent arterioles branch into peritubular capillaries around PCT and DCT How is urine made in the kidney? 1.)Reabsorption - moving substances with tubule into the blood. 2.)filtration - occurs in the glomerulus or renal corpuscle 3.)secretion 4.)filtration driving force for filtration hydrostatic pressure or BP What fluid comes out of the glomerulus? filtrate What is filtrate? mostly water, electrolytes, nutrients, and waste products. Glucose is normal in filtrate. -similar to blood plasma Reabsorption in the Nephron Loop Only water is absorbed in the descending limb. Na+ chloride is absorbed in the ascending limb (no water).