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by: Tia Spears

UrinarySystempart1.pdf Biol 2120

Marketplace > Georgia State University > Biology > Biol 2120 > UrinarySystempart1 pdf
Tia Spears
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About this Document

These notes cover part 1 of the urinary system
Human Anatomy & Physiology 2
Class Notes
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This 2 page Class Notes was uploaded by Tia Spears on Wednesday March 30, 2016. The Class Notes belongs to Biol 2120 at Georgia State University taught by Safer in Fall 2016. Since its upload, it has received 9 views. For similar materials see Human Anatomy & Physiology 2 in Biology at Georgia State University.


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Date Created: 03/30/16
Urinary System  Function of urinary system: o Maintains homeostasis  Regulates water volume, concentrations, and pH levels  Regulates he balance of salt and water in the blood  Influences red blood cell production and blood pressure o Filters out (excretes) wastes from the body  Filters out nutrients and wastes allowing for the nutrients to be absorbed into the body and removes the waste from the body  Kidneys o Retroperitoneal – lie between the dorsal wall and the peritoneum o 3 distinct layers:  Renal cortex – outermost layer  Renal medulla – a set of cone-shaped masses of tissue that secrete urine into tiny sac-like tubules  Renal pelvis – innermost layer; funnel-shaped tube surrounded by smooth muscle that uses peristalsis to move urine out of the kidney, into the ureter, and to the bladder o Main function: filter blood continuously (20% of total blood volume) o Each kidney is composed of many tubular nephrons that produce urine o Each nephron is composed of several parts  Glomerular capsule (Bowman’s capsule)  Glomerulus  Renal tubule  Proximal convoluted tubule (PCT) o Cuboidal epithelial cells o Mitochondria makes ATP to pull sodium ions from the filtrate, using active transport o Cells are covered in microvilli that increase their surface area and help with reabsorption  Loop of the nephron (loop of Henle) o Drives the reabsorption of water by creating a salt concentration gradient in the tissue of the medulla  Distal convoluted tubule (DCT) o Steps of nephrons:  Glomerular filtration  Tubular reabsorption  Tubular secretion


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