Exrection

Question 1

What organs are involved in excretion?

Answer 1

Liver
-Kidney
-Lungs
-Skin

Question 2

Is urea less soluble than ammonia?

Answer 2

Yes

Question 3

What produces bile pigments that are xcreted in the feaces?

Answer 3

Breakdown of heam from heamoglobin

Question 4

What happens to body mass during weight loss?

Answer 4

-Body fat/glycogen broken down and used for respiration
-Respired to produce carbon dioxide and water
-Waste products cause decrease in body mass

Question 5

Define excretion

Answer 5

The removal/ processing of waste from the body

Question 6

Define Metabolic waste

Answer 6

Waste produced from metabolism e.g CO2, urea

Question 7

Define deamination

Answer 7

Removal of ammonia from amino acids

Question 8

Define egestion

Answer 8

Removal of undigested waste by defaction

Question 9

Define secretion

Answer 9

A process by which substances are produced and discharged from a cell, gland or organ for a particular function in the organism

Question 10

What does excretion maintain?

Answer 10

Excretion maintains normal metabolism and homeostasis by keeping levels of certain substances in the blood

Question 11

What are the main waste products of excretion?

Answer 11

-Carbon dioxide
-Nitrogenous waste in the from of urea

Question 13

What does the body do with excess amino acids?

Answer 13

-The body cannot store amino acids
-But they still contain energy so in the liver potentiality toxic amino acids are removed(deamination)
-This makes a soluable and highly toxic compound-ammonia

Question 14

What happens to the ammonia produced at deamination?

Answer 14

Ammonia is converted into a less soluable compound called urea which is transported to the kidneys for excretion
2NH3 + CO2-> CO(NH2)2 + H2O