Question

Trace a molecule of urea from the arcuate artery to the point that it exits from the female urinary tract. This answer should be in complete sentences to describe the tubes and structures urea passes through, in order, to become urine, and to describe how urea end up leaving the body

Answer 1

• At the junction of cortex and medulla interlobar arteries bend over to form incomplete arches called arcuate arteries.
• Urea present in the arcuate artery pass to small radial arteries which is branch off at right angles from the arcuate artery,
• From radial artery ,it then pass down into afferenet arteriole.
• From afferent arteriole urea pass into glomerulus .It then get filtered to Bowman's capsule.
• Then urea pass through proximal convoluted tubule(PCT) then into descending limb of loop of Henle and ascending limb of loop of Henle.
• By passing through two limbs of loop of Henle, it then entered into distal convoluted tubule , from there urea pass into collecting duct.
• Several collecting duct join to form papillary duct or duct of Bellini.Urea then enter into apex of renal pyramid where urine gets collected in minor calyx, later in major calyx. Calyces open in pelvis , located inside hilum of kidney.
• Urea in the pelvis is passed into duct like structure called ureter and then into urinary bladder.
• When the urinary bladder get filled , an outlet passage in the bladder called urethra through which urea flows out.
• Then urea get passed outside through urethral opening.