Explain the path of urine production from the afferent arteriole to the urethra.

Expert Solution

Path of urine production from the afferent arteriole to the urethra:

Renal tubules of nephron ? Collecting ducts ? Papillary ducts ? Minor calyces ? Major calyces ? Pelvis ? Ureter ? Urinary bladder ? Urethra.

Urine is generated from the blood when the blood reaches the malpighian corpuscle. Malpighian corpuscle is composed of the Bowman's capsule and glomerulus. Here most of the blood plasma is filtered out into the Bowman's capsule. Glomerular filtrate is taken down the proximal convoluted tubule (PCT). Most of the water, glucose and amino acids are reabsorbed here.

Fluid then passes to the loop of Henle, where Na+ and K+ are reabsorbed. All the absorbed materials enter the peritubular capillaries. The fluid then passes on to the distal convoluted tubule where tubular secretion takes place. This fluid then passes on to the collecting duct where the tissues reabsorb some urea from it. A lot of water gets reabsorbed along collecting duct and urine becomes concentrated.

Pelvis gives rise to ureter which travels out of kidney through hilum. The ureter pours urine into urinary bladder. When the bladder gets full, stretch receptor sends signal to brain and feel urge to micturate. The outlet that travels from bladder is called urethra.

gladiator answered 2 years ago

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