Excretion in humans

Question 1

What is secreted from the lungs?

Answer 1

CO2

Question 2

What do kidneys excrete?

Answer 2

urea and excess water and ions

Question 3

Where is urea formed?

Answer 3

the liver

Question 4

From what is urea formed?

Answer 4

excess amino acids

Question 5

Describe deamination

Answer 5

the removal of the nitrogen-containing part of amino acids to form urea

Question 6

Explain the importance of excretion, limited to
toxicity of urea

Answer 6

urea is a nitrogenous waste product that is formed from the breakdown of proteins in the liver. It is then transported to the kidneys, where it is filtered out of the blood and excreted from the body in the form of urine.

If urea is not excreted from the body, it can build up to toxic levels in the blood. This can lead to a condition called uremia, which can be life-threatening if left untreated

Question 7

state the role of the glomerulus

Answer 7

filtration from the blood of water, glucose, ions and urea

Question 8

state the role of the nephron

Answer 8

reabsorption of
all of the glucose, some of the ions and most
of the water back into the blood

Question 9

where is urine formed?

Answer 9

collecting duct

Question 10

what is urine formed of?

Answer 10

urea, excess water and excess ions