Excretion

Question 1

What are the main products that are excreted?

Answer 1

> CO2 from respiration
nitrogen-containing compounds eg. urea
other compounds such a bile pigments

Question 2

How do the lungs excrete CO2?

Answer 2

CO2 is passed into the bloodstream and is diffused into the alveoli to be excreted as you breathe it out

Question 3

How does the liver assist in excretion?

Answer 3

> some substances passed into bile and directly removed

> converts amino acids to urea via de amination

Question 4

How is the skin involved in excretion?

Answer 4

> substances such as urea water and ammonia are excreted through sweat

Question 5

Carbon Dioxide excretion?

Answer 5

> most CO2 is transported in the blood as hydrogen carbonate ions (h+ released)

Question 6

Excretion of nitrogenous compounds

Answer 6

> body cannot store amino acids
amino group is removed to form ammonia
Ammonia is then converted to urea which is transported to the kidneys for excretion