1.5 Water

Question 1

Nutrients value

Answer 1

None

Question 2

How much of the body consists of water:

Answer 2

approx 2/3 - varies with weight and sex

Question 3

Ways in which water is lost from the body

Answer 3

Perspiration - secreted by glands onto the skin.

Respiration - during exhalation water vapour is expelled.

urine
vomiting
bleeding
tears

Question 4

How much blood is in the body?

Answer 4

Approx 6 litres

Question 5

The Adequate Intake of water for males and females:

Answer 5

M: 3 Litres approx 3 cups
F: 2.2 litres approx 9 cups

or 30mls of water for each kg.

e.g. 60kg x 30ml = 1800ml or 1.8ml

Question 6

Functions of water

Answer 6

• Solvent for chemical substances
• Vehicle for transportation of blood cells
• Assist the digestive system
• Maintain body temp
• Lubricate joints and various membranes
• Shock absorber for joints
• Maintain blood volume by maintaining sodium and - potassium balance in and out of cells;

Question 7

Sources of water

Answer 7

Drinking water and all beverages except alcohol and seawater.

Meats: 50-60% water

The body’s metabolic processes create water
By product of various nutrient digestion. approx 0.33L can be used by the body.

Question 8

Dehydration

Answer 8

Symptoms: diarrhea, vomiting, high fever or burns.
Likely to occur after exercise or hot weather.
Food intake can reduce effect for short period.

Severe dehydration

• kidney damage
• death

Mild:
- fatigue, headaches

Question 9

Excess water consumption

Answer 9

increased urination leads to poor absorption of essential nutrients, kidneys cannot excrete enough fluids.