Excretion - Dayna Bailey

Question 1

Excretory Organs

Answer 1

Lungs
Kidneys and bladder
Liver and intestines
Skin

Question 2

Substances excreted by Lungs

Answer 2

CO
water vapour
heat

Question 3

Substance excreted by kidneys

Answer 3

Urine

Question 4

What does urine consist of ?

Answer 4

excess water
mineral salts
nitrogenous waste products:
urea, uric acid and creatinine

Question 5

Substances excreted by Liver and Intestines

Answer 5

Urea

Bile pigments

Question 6

How urea is transported and excreted

Answer 6

Transported in the blood to the kidneys and is excreted in urine

Question 7

How bile pigments are transported and excreted

Answer 7

Pass into the small intestine and are excreted as bile salts in the faceces

Question 8

Substance excreted by skin

Answer 8

Sweat

Question 9

What does sweat consist of

Answer 9

excess water
salts
small amount of urea

Question 10

Metabolic waste products origins’

Answer 10

CO- product of cellular respiration
Excess water- cellular respiration as well as intake of fluids and food
Urea- formed in liver from deamination of excess amino acids
Uric acid- end product of metabolism of nucleic acids
Creatinine- formed from creatinine phosphate in the cells
Bile pigments- formed in liver during breakdown of haemoglobin

Question 11

Structure of Urinary system

Answer 11

Consists of 
two kidneys 
two ureters
bladder 
urethra

Question 12

Excretion

Answer 12

removal of metabolic wastes from the body

Question 13

Egestion

Answer 13

The removal of undigested substances- substances that are not products of metabolism and were never inside cells

Question 14

Secretion

Answer 14

The release of useful substances that are produced by cells for important functions
e.g. digestive juices, hormones and milk