Function of the excretory system PDF

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EXCRETORY SYSTEM NOTES Function of the excretory system  Remove waste produce  Remove poison from body Nephron  Take urea unwanted stuff from the blood Urine is made up of  Water  Salt  Urea How long can a healthy bladder hold 16oz of urine?  Few hours Main Function of the Excretory System  To remove waste from the body so as to maintain homeostasis  Cells produce waste as a result of Chemical reaction that occurs in organelles and the body has to remove them Waste Includes: 1. Carbon Dioxide 2. Excess salt 3. Urea

EXCRETORY SYSTEM NOTES Homeostasis  Helps keep the balance on the body o

Ex. Body working

Organs of the Excretory System 1. Skin- sweating or perspiration 2. Lungs-exhaling CO2 3. Kidneys- filtering blood 4. Large Intestine- rids solid waste Organs Involved  Kidneys: contains units called nephron which do the filtering  Uterus : connect kidneys to bladder  Bladder: contains urine  Urethra: Urine is waste Pathway of Urine: Kidney Ureters Bladder Urethra Process o cleaning the Blood:  Occurs in the nephron (filtering unit of the kidney) Step 1: Filtration Process: 1. The renal vein brings the impure blood into the kidney The kidney filters the blood removing waste and water 2. Reabsorption

EXCRETORY SYSTEM NOTES  Body will take back any materials it still needs using active transport in the Bowman’s Capsule o

Glucose (sugar)

o

Amino Acid

o

Vitamins

o

Water: Depends on the body condition

3. Excretion a. The liquid waste passes through the ureter into the urinary bladder where the urine is collected. b. Finally, the urine exists the body through the urethra. Summarize:  3 steps for nephron to clean the body 1. Filtration 2. Reabsorption 3. Excretion  Our bodies filter 180 liters of fluid a day. What do we only excrete about 2 liters a day? o

We need to rest to help us in Homeostasis.

 How would a diet high in salt affect the urinary system? o

Go often to the restroom.

 Why does the volume of urine output vary from day to day? o

Depends on your body condition.

EXCRETORY SYSTEM NOTES...