water

Question 1

What percentage of the body is made up of water

Answer 1

65%

Question 2

State 5 functions of water in the body

Answer 2

• it helps regulate the body’s temperature (37°C) through sweat. Without this cooling system, we would become ill from heatstroke
• helps the kidneys flush out harmful substances from our blood
• kidneys filter waste products and eliminate them from the body as urine
• transports nutrients, oxygen and carbon dioxide round the body
• it is needed by nearly all body processes e.g. digestion, to remove waste products from the body as urine and faeces
• water is found in all cells and tissues in our body
• helps prevent the skin drying out and ensures that the lining of the digestive system and lungs are kept moist

Question 3

State 4 symptoms of dehydration

Answer 3

• headaches
• dark-coloured urine
• feeling weak
• feeling sick
• being confused
• quick heartbeat
• changes in blood pressure

Question 4

Why would someone die from a shortage of water?

Answer 4

The blood gets thicker and is therefore more difficult to pump around the body, so the heart stops.

Question 5

On average, how many litres pass out of the body each day as urine?

Answer 5

1 to 2.5 litres

Question 6

How many litres of water are lost from the body each day as breath and sweat?

Answer 6

1 litre

Question 7

What four things does the amount of water we need depend on?

Answer 7

• weather
• physical activity levels
• amount of salt we eat
• our age

Question 8

Define water intoxication

Answer 8

Drinking too much water

Question 9

How can water intoxication be dangerous?

Answer 9

There is too much water in your diet, so the kidneys will not be able to work quickly enough to remove the water from the body

Question 10

State 4 symptoms of water intoxication

Answer 10

• headaches
• nausea
• vomiting
• death in extreme circumstances

Question 11

Good source of water

Answer 11

Fruit&veg