1. Noah Pruitt & Lizzy Burry 5th Period AP Biology
Excretory system
Noah Pruitt & Lizzy Burry
5th Period
AP Biology

2. The Excretory system is responsible for the elimination of wastes produced by homeostasis.
Includes:
urinary system
lungs
Skin
large intestines
liver
What is it?

3. Kidneys: Filters blood of toxins and produces urine
Ureters: Tubes that transport urine from kidney to bladder
Bladder: Sac that contains urine until needed release
Urethra: Transports urine from bladder to outside of body
Urinary system

4. Vasopressin- allows the water to be reabsorbed and controls the volume of urine
Aldosterone- responsible for regulating sodium reabsorption
these both regulate the concentration of water and salt in the kidneys
Hormones in kidneys

5. There are three processes: filtration, reabsorption, and secretion
Filtration- as the filtered blood passes through the glomerulus to the Bowmans capsule small substances pass through capillary walls
Reabsorption- the filtrate moves through proximal convoluted tubule some may be absorbed. Small solutes leave and are reabsorbed by the peritubular capillaries. The material that remains in the tubule is urine
Secretion- the filtrate then moves through convoluted tubules some substances are secreted from capillaries into tubules
How is urine made?

6. Lungs Cellular respiration produces carbon dioxide waste
Carbon dioxide is diffused out of the cells, into the bloodstream
Reaching the lungs, alveoli derives the carbon dioxide out of the blood
Put into lung tissue to be released during exhalation
Lungs

7. Skin Sweat is also a form of waste Holds urea, salts, and water
Sweat glands are mixed with capillaries
Waste enters the sweat gland from the capillary and leave the body as sweat
Skin

8. Large Intestines Around 5 feet in length Collects bodily waste
Extracts water
Allows for solid waste
Bacteria, water, and undigested food create feces
Anus
Large Intestines

9. Break down any toxins, chemicals, or poisons in the body
Creates bile that breaks down fats into usable wastes and fats
Bile is stored in gall bladder
Converts ammonia into urea
Liver

10. Fun Facts The bladder is as large as the brain
7.8 trillion gallons of fluids are released by the body in its lifespan
The largest vein in the body is the one that leads to the kidney
Males have a longer urethra than females
Fun Facts

11. Quiz 1. What chemical derives the carbon dioxide from the lungs?
2. The urinary system contains what 4 parts?
3. What organ breaks down any toxins, poisons, or chemicals in the body?
4. The large intestine allows for what sort of waste?
5. What sort of veins are sweat glands mixed with?
Quiz

12. Answers 1. Alveoli 2. Kidney, Ureters, Bladder, Urethra 3. Liver
4. Solid
5. Capillaries
Answers

13. Resources www.sciencedaily.com/articles/e/excretory_system.htm
important-organ/
excretory-system.php
Resources