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Urinary System

by: Elizabeth Valente

Urinary System BSC 2023

Elizabeth Valente

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Human Biology
Paul Sharp
Class Notes
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This 5 page Class Notes was uploaded by Elizabeth Valente on Tuesday November 17, 2015. The Class Notes belongs to BSC 2023 at Florida International University taught by Paul Sharp in Spring2015. Since its upload, it has received 119 views.


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Date Created: 11/17/15
Urinary System Organ system consisting of the kidneys and urinary bladder. Excretion: Rids the body of nitrogenous waste and metabolic waste. Helps regulate the water-salt balance of blood. Urea Primary nitrogenous waste of human derived from amino acid breakdown. Kidneys Organ of the urinary system that produces and secretes urine. Fist-sized organ. Produces hormone calcitriol: increases blood calcium levels. Produces hormone erythropoietin è stimulates red blood cell production. • Kidneys are so efficient that you can live without one of them. Renal Artery Vessel that transports blood to be filtered from the aorta and delivers it to the kidney. Renal Vein Vessel that takes filtered bloom from the kidney to the interior vena cava. Renal Cortex Outer portion of the kidney that appears granular. Renal Medulla Inner portion of the kidney that consists of renal pyramids. Renal Pelvis Hollow chamber of the kidney that lies inside the renal medulla. Receives freshly prepared urine from the collecting ducts. Ureters One of 2 tubes that take urine from the kidneys to the urine bladder. 25 cm long; 5 mm diameter. Urinary Bladder Organ where urine is stored. Approx. 800 ml. Small folds mucosa prevent backward flow to ureters. Internal sphincter (involuntary) and external sphincter (voluntary). Approx. 30 ml, stretch receptors send 1 nerve sign to CNS. Urethra Tubular structure that receives urine from the bladder. Carries urine to the outside of the body; 4 cm in females and 20 cm in males. Micturition Emptying of the bladder. Urination. Nephrons Microscopic kidney unit that regulates blood composition by: glomerular filtration (red and white blood cells don’t get filtered), tubular reabsorption and tubular secretion. Glomerular Capsule (Bowman’s Capsule) Doubled-walled cup that surrounds the glomerulus at the beginning of the nephron. Glomerulus (Filter) Cluster of capillaries surrounded by the glomerular capsule in a nephron. Where glomerular filtration takes place. Peritubular Capillary Network Capillary network that surrounds a nephron and functions in reabsorption during urine formation. Proximal Convoluted Tubule è Tubular reabsorption. Close. Distal Convoluted Tubule è Tubular secretion. Distant, far. 3 Steps of Urine Formation 1. Glomerular Filtration 2. Tubular Reabsorption 3. Tubular Secretion Whatever that is in the collecting duct is going to the bladder. iClicker Question Which of the three main processes of urine formation involves movement of waste from the peritubular capillary network to the distal convoluted tubule of a nephron so that it’s added to urine? a. Glomerular filtration b. Tubular reabsorption c. Tubular secretion d. Tubular termination Answer: c. Tubular secretion 11/17/15 5:48 PM 11/17/15 5:48 PM


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