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Homeostasis and the Excretory System

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Greg Stimmler

on 12 September 2014

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Transcript of Homeostasis and the Excretory System

Homeostasis and the Excretory System
Functions of the Excretory System
The excretory system keeps the chemical makeup of the blood at a constant state.
Homeostasis- Internal stability maintained by the body

Excretory System- Rids body of chemical waste

Negative Feedback Loops- Returns a system back to its original state

Parts of the Excretory System
Kidneys-Regulate the water and salt balance in the blood, then filters extra secretes urine
Ureter-Carries the urine from the kidneys to the bladder
Urinary bladder-Temporarily stores urine until it can exit the body
Urethra-hole through which urine exits the body
Skin: Small amounts of urea (waste) also leave the skin through sweat

4. Urine is transported to the bladder and awaits exit from the body.

3.Remaining filtrate (ex. extra water, salts, some toxins) is secreted into urine.

Noah Holihan, William Chen, Greg Stimmler
1. Blood pressure forces water and other solutes (substances such as salt), into the kidney. This filtrate passes through millions of tiny filtration units.

2. Water, nutrients, and some solutes are reabsorbed into the blood.

Feedback Loops
The excretory system is a negative feedback loop as it returns the chemical makeup of blood back to its orginal state.
The blood is filtrated and extra water is secreted into urine and forced out of the body.

Too much Water?
Not Enough Water?
The brain creates feelings of thirst and directs the kidneys to reabsorb more water when filtering the blood.

1. Campbell, Neal A., Brad Williamson, and Robin J. Heyden. "Concept 32.2." Biology: Exploring Life. Boston, MA: Pearson Prentice-Hall, 2006. 701-04. Print.
2. "Digestive and Excretory Systems." Oswego City School District Regents Exam Prep Center. Oswego City School District Regents Exam Prep Center, 2014. Web. 9-11 Sept. 2014.
3. "Homeostasis: Positive/ Negative Feedback Mechanisms." Anatomy & Physiology. Anatomy & Physiology, 18 May 2013. Web. 9-11 Sept. 2014. <http://anatomyandphysiologyi.com/homeostasis-positivenegative-feedback-mechanisms/>.
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