Excretory System Power Point

8/2/2019 Excretory System Power Point

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Excretory System

by Drew Buzzell, Eirik Somerville,

Alex Pernokas, Oliver Saffery, andSam Morrow


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Overview of Excretory System3 The excretory system is responsible for maintaining body

homeostasis by controlling fluid balances, and removal of waste products.3

When cells break down proteins they create nitrogenous wastecalled Urea; the excretory system removes this waste and other wastes created as a byproduct of digestion.

Urinary System 1. After the blood gets pumped to the kidney, water and other solutes are filtered

through the nephrons.2. Then the filtered waste and excess water reconvenes as Urine in the Ureter.3. After traveling through the Ureter it is stored in the Bladder.4. When the Bladder is full it is then expelled by the Urethra.

3.NIDDK scientists and outside experts, . "Your Urinary System and How it Works." Kidney and Urologic Diseases A to Z (2007): 1-4. Web. 14 Nov 2010..


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Major Organs Involved


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Purpose of Major Organs3

Kidney - Filters water and all solutes except proteins fromblood; reclaims water and solutes as the body requires.Excretes the remainder, as urine.

Ureter - Channel for urine to flow from kidney to urinarybladder.

Urinary Bladder - Stretchable container for temporarily storingurine.

Urethra - Channel for urine to flow from the urinary bladder tothe body surface.

3. Starr, Cecie. Biology: the unity and diversity of life. 11th ed. Australia: Thomson Brooks/Cole, 2006. Print.


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Relation to Homeostasis2

The kidney removes water, vitamins, and minerals whenthey are in excess within the bloodstream, but reclaims themwhen they are too scarce. In this sense, the kidney is amajor organ for homeostasis because it maintains anequilibrium.

2. "The Kidneys." RCN D.C. Metro | High-Speed Internet, Digital Cable TV & Phone Service Provider. N.p., n.d. Web. 9 Nov. 2010..


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Purpose of Nephron Millions of nephrons located inside of each kidneys Responsible for filtration and purification of blood Creates urine


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Parts of a Nephron


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Nephron Overview Video
http://www.youtube.com/watch?v=glu0dzK4dbU


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Glomular Filtration3 Pressure of heart contractions

filters blood by forcing water,ions and solutes from glomularcapillaries into Bowman'scapsule3

Leaves behind blood cells andproteins

First step in urine formation

Osmosis and active filtration

Substances that passes throughbecome filtrate



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Tubular Reabsorption3

Variety of substances (water, ions, and selected solutes)leak out of the nephron, diffuse through interstitial fluid, andthen enter a peritubular capillary3

Occurs along a nephron's tubular parts Returns most of filtrate back to blood

Water is transported via osmosis3 o High to low concentration

Passive and active transportation (tubule capillary)



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Tubular Secretion3

Transporters move urea, H+, and K+, (wastes) from the capillaries into the nephron for excretion1

Continues along nephron's tubular parts Active transportation (capillary tubule)



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References1. NIDDK scientists and outside experts. "Your Urinary System and Howit Works." Kidney and Urologic Diseases A to Z (2007): 1-4. Web. 14 Nov2010. . 2. "The Kidneys." RCN D.C. Metro | High-Speed Internet, Digital Cable TV & Phone Service Provider . N.p., n.d. Web. 9 Nov. 2010..

3. Starr, Cecie. Biology: the unity and diversity of life . 11th ed. Australia:Thomson Brooks/Cole, 2006. Print.

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Excretory System Power Point