The role of the optimum temperature in cellular activities is to

1.  change the chemical reactions
2.  balance the equilibrium of the reactions
3.  destroy many enzymes at once
4.  speed up the rate of chemical reaction
5.  create favourable environment for enzymes

Animals which are able to maintain fairly constant body temperature are described as

1.  poikilothermic
2.  hydrostatic
3.  sympathetic
4.  symbiotic
5.  homoiothermic

Which of the following processes is involved in the regulation of body temperature in human beings?

1.  Urination
2.  Painting
3.  Deamination
4.  Sweating
5.  Detoxification

A structure which controls the body balance in humans is located in the

1.  outer ear
2.  eardrum
3.  inner ear
4.  middle ear
5.  inner membrane

A rise in the temperature of a human body is corrected by

1.  construction of the skin arteries and sweating
2.  construction of the skin arteries and shivering
3.  dilation of the skin arteries and sweating
4.  dilation of the skin arteries and shivering
5.  shivering and sweating

A patient has been diagnosed with low level of blood sugar. Which hormone would you recommend to regulate the victims sugar? 

1. Insulin 
2. Glucagon
3. Antidiuretic 
4. Aldosterone 
5. Testosterone

Rise of body temperature in the human body is corrected mainly by

1.  Dilating the skin arteries and sweating
2.  Constricting the skin arteries and shivering
3.  Dilating the skin veins and sweating
4.  Constricting the skin veins and shivering
5.  Dilating of arteries and shivering

Explain how mammals regulate their internal body temperature in response to external environmental changes.

(a) Define the term “osmoregulation”.

(b) Briefly explain the mechanisms of regulating sugar level in the blood.

1. When the temperature of the surroundings is low.

2. When the body temperature rises due to increase in the surrounding temperature.

Briefly explain why people look pale when they feel cold.

How does the skin of a man regulate internal body temperature when the external environment is overheated? Briefly explain by giving three ways.

Water and salts are needed in constant amount for effective functioning of the body. Briefly explain three factors which affect the content of salts and water in human body.

DifTerentiate the term hyperglycaemia from hypoglycaemia.

Give four symptoms of a person suffering from diabetes mellitus.