Excretory System

Question 1

Functions

Answer 1

1. eliminate waste
2. regulate blood flow/pressure
3. regulate blood pH
4. balance body fluids
5. produce urine
6. regulate the concentration of certain solutes in the blood

Question 2

Organs involved

Answer 2

1. Skin
2. Lungs
3. Liver
4. Kidneys
5. Ureters
6. Urinary bladder
7. Urethra

Question 3

Skin

Answer 3

1. Removes extra water, salts, and urea in sweat
2. Sweat released which helps keep body temperature constant

Question 4

Lungs

Answer 4

1. Blood transports Co2 from body to the lungs (cellular respiration)
2. When you exhale, water vapor and Co2 are released
3. Regulating Co2 levels is important

Question 5

Liver

Answer 5

1. Converts toxic nitrogen-based waste (made through protein breakdown) into urea (less toxic compound)
2. Urea is transported to blood via circulatory system and sent to kidneys for elimination

Question 6

Kidneys

Answer 6

1. A pair of fist sized, bean shaped organs
2. Filter out waste, extra water, urea, salt, and metabolic waste from blood
3. Nephrons (1 million per kidney) that absorbed valuable substances and get rid of waste

Question 7

Ureters

Answer 7

Pair of tubes that transport urine from kidney to urinary bladder

Question 8

Urinary bladder

Answer 8

Stores urine until it is released via urethra

Question 9

Urethra

Answer 9

Empties bladder, releases urine outside of the body

Question 10

Homeostasis

Answer 10

1. Nitrogenous waste (ammonia/urea) come from digestion and have to be removed regularly
2. Kidneys control sodium levels by removing and reabsorbing sodium ions - helps control osmotic pressure
3. Kidneys regulate pH by filtering out hydrogen ions and allowing bicarbonate to be reabsorbed into blood
4. Glucose is a sugar not usually filter out (ppl with diabetes have too much glucose)