Excretory system

Question 1

ex system controlled by

Answer 1

brainstem, most waste gone by urine

Question 2

parts of ex system

Answer 2

Kidneys
Ureter
Urinary Bladder
Urethra

Question 3

Process of Urinary Excretion

Answer 3

Urine is formed in the kidneys through filtration of blood
Travels down the ureters and is stored_in the bladder
During urination, urine travels through the urethra and is excreted.
We process 800-2000mL of urine daily (up to 2L)

Question 4

steps forming urine

Answer 4

1. filtratration
2. reabsorption
3. secretion

*nephrons in kidney filter blood

Question 5

Is there a connection from the stomach to the kidneys?

Answer 5

Fluid is absorbed mostly through the small intestine into the blood stream which is then filtered by the kidneys

Question 6

Kidneys

Answer 6

Located at the back of the abdominal cavity
Approximately 11cm in length in adults
Receive blood from renal arteries
Branch off of the descending aorta
Each kidney attaches to a ureter

Question 7

ureter

Answer 7

Originate at each kidney and connect to the bladder
Tubes of smooth muscle that carry urine
25-30cm long and 3-4mm in diameter
Kidney Stones
Hard calcium oxalate crystals
Extremely painful

Question 8

bladder

Answer 8

Hollow muscular organ
Collects and stores urine
Can hold between 300-500mL of fluid before urge to empty occurs
Can expand to hold upwards of _800-1000ml

Question 9

urethra

Answer 9

Removes urine from the body
Longer in men than women
Final stage of excretory system

Question 10

lungs

Answer 10

Lungs help to excrete carbon dioxide
By-product of chemical reaction of food with stomach acid

Exercise
Fat converted to CO2
10kg fat (22 lbs)
CO2 – 8.4 kg (18.5 lbs)
Water – 1.6 kg (3.5 lbs)