Excretion in humans Details

Question 1

Carbon dioxide is excreted through…

Answer 1

the lungs

Question 2

Function of kidneys

Answer 2

Excrete urea and excess water and ions

Question 3

Urine is the combination of…

Answer 3

urea with excess water and excess ions

Question 4

Function of the glomerulus

Answer 4

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

Question 5

Function of the nephron

Answer 5

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

Question 6

Urinary system

Answer 6

-The glomerulus(beginning of the tubule) filters water, glucose, urea and salts from the blood
-The rest of the tubule reabsorbs most(but not all) of the glucose, water and salts back
NB: the urea stays in the tubule and it along with the other remaining components in the tubule are referred to as urine from now on
-The urine leaves the kidney via the ureter and eventually leaves the body through the urethra

Question 7

Where urea is formed

Answer 7

In the liver(from excess amino acids)

Question 8

Function of the liver

Answer 8

-Assimilates amino acids by converting them to proteins
-Produces bile

Question 9

Importance of excretion(limited to the toxicity of urea)

Answer 9

Urea is toxic to the body in higher concentrations, and hence must be excreted