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by: Tia Spears

UrinarySystempart2.pdf Biol 2120

Marketplace > Georgia State University > Biology > Biol 2120 > UrinarySystempart2 pdf
Tia Spears
GPA 3.0

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About this Document

These notes cover part 2 of the Urinary System
Human Anatomy & Physiology 2
Class Notes
25 ?




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Popular in Biology

This 1 page Class Notes was uploaded by Tia Spears on Thursday March 31, 2016. The Class Notes belongs to Biol 2120 at Georgia State University taught by Safer in Fall 2016. Since its upload, it has received 8 views. For similar materials see Human Anatomy & Physiology 2 in Biology at Georgia State University.


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Date Created: 03/31/16
Urinary System (part 2)  Glomerular Filtration Rate – how much blood passes through the glomeruli every minute  ADH (Antidiuretic hormone) – is secreted by the posterior pituitary gland and helps the body retain water and stay hydrated o Alcohol and caffeine o Very little water reabsorption (aquaporins)  Aquaporins – special protein channels in the membrane on the apical (filtrate facing side) and the basal (capillary facing side) of the cells  Once the urine leaves the kidneys, it enters the ureters: slender tubes that attach the kidneys to the urinary bladder. o Each ureters consist of smooth muscle that contracts to move urine using peristalsis.  Bladder – hollow sac which stores urine o 3 Layers:  Inner mucosa – transitional epithelium which expands the bladder  Detrusor – thick muscular layer  Outer membrane – fibrous, protective layer o Empty bladder: collapses into triangular shape  Rugae – the folds when the bladder is collapsed o Full bladder: expands into a pear shape  Comfortable hold 500 ml of pee but maximum is 1 L.  Urethra o Internal urethral sphincter o Urogenital diaphragm o External urethral sphincter – made of skeletal muscles and controlled voluntarily  Urination (Micturition) o The detrusor contracts o The internal urethral sphincter opens o The external urethral sphincter opens


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