(i)

Bedwetting is the unconscious release of urine while asleep.

(ii)

Diseases that may result from bedwetting

1. Skin rashes
2. Yaws
3. Eczema
4. Sores

i)

Importance of excretion in living organisms

1. If metabolic waste substances/products were not removed, they would be injurious/poisonous to the body
2. It removes waste products from the body

ii)

(i)

Functions of the skin

1. It excretes waste substances/urea/water/salts/sweat
2. It protects the body from injury
3. It regulates body temperature
4. It gives sense of touch

(ii)

Functions of the lung

1. Gaseous exchange occurs in the lungs/there is intake of oxygen and output of carbon dioxide and water vapour in the lungs
2. Excretion of carbon dioxide and water vapour takes place in the lungs

(iii)

Functions of the kidney

1. It excretes urea/water and salt
2. Urine formation

(i)

Excretion is the process of removing metabolic waste/substances from the body of a living organism.

(ii)

(i)

Excretion is the process of removing metabolic waste/substances from the body of a living organism.

(ii)

Respiration is the process whereby oxygen is used in living cells to breakdown food leading to the release of energy.

OR

Respiration involves the taking in of oxygen and giving out of carbon dioxide.

OR

Respiration is the breakdown of food to release energy.

(iii)

Excretion → skin, kidney, lung, liver
Respiration → Lungs