Get premium membership and access questions with answers, video lessons as well as revision papers.
the body temperature of a mammal is kept constant
to maintain this temperature the mammal must be able to balance its heat loss against the heat gain
body temperature is controlled by the hypothalamus, a specialized part of the brain
changes in the temperature within the body and the surrounding are detected by the hypothalamus it transmits impulses to the skin and the blood stream in response to temperature changes hypothalamus acts as a thermostat for the body
a mammal loses heat by breathing out, urine, feaces, skin by radiation and by evaporation of sweat.
A mammal generates heat by the activity of its muscles, by general metabolism in respiration, or chemical activities
In hot conditions the hypothalamus stimulates responses that increase heat loss from the body hence lowering the body temperature
Such responses include sweating, vasodilation, keeping its hair ?at on the surface of skin and reduction of metabolic rate
In cold conditions the hypothalamus stimulates responses that generate heat gain in the body and reduce heat loss to the environment
Such responses include shivering, vasoconstriction, raising its hair to trap a layer of air around the skin because still air is a good insulator of heat and by generation of heat by increasing metabolic rate.
Mohaissack answered the question on October 5, 2017 at 14:27
- Explain the advantage gained by possessing a constant body temperature(Solved)
Explain the advantage gained by possessing a constant body temperature
Date posted: October 5, 2017. Answers (1)
- Why is constant body temperature maintained by mammals?(Solved)
Why is constant body temperature maintained by mammals?
Date posted: October 5, 2017. Answers (1)
- Why is homeostatic control necessary?(Solved)
Why is homeostatic control necessary?
Date posted: October 5, 2017. Answers (1)
- Name the common kidney diseases(Solved)
Name the common kidney diseases
Date posted: October 5, 2017. Answers (1)
- State and explain the adaptations of proximal convoluted tubule to its function(Solved)
State and explain the adaptations of proximal convoluted tubule to its function
Date posted: October 5, 2017. Answers (1)
- Describe how the human kidney functions(Solved)
Describe how the human kidney functions
Date posted: October 5, 2017. Answers (1)
- State the functions of the liver(Solved)
State the functions of the liver
Date posted: October 5, 2017. Answers (1)
- State three functions of cuticle found in plant leaves(Solved)
State three functions of cuticle found in plant leaves
Date posted: October 5, 2017. Answers (1)
- What is the role of lungs in excretion?(Solved)
What is the role of lungs in excretion?
Date posted: October 5, 2017. Answers (1)
- Explain how the mammalian skin is adapted to its functions(Solved)
Explain how the mammalian skin is adapted to its functions
Date posted: October 5, 2017. Answers (1)
- List excretory organs and products of mammals(Solved)
List excretory organs and products of mammals
Date posted: October 5, 2017. Answers (1)
- Describe excretion in unicellular organisms(Solved)
Describe excretion in unicellular organisms
Date posted: October 5, 2017. Answers (1)
- State the excretory products of plants and some of their uses to humans(Solved)
State the excretory products of plants and some of their uses to humans
Date posted: October 5, 2017. Answers (1)
- Why do plants lack complex excretory structures like those of animals?(Solved)
Why do plants lack complex excretory structures like those of animals?
Date posted: October 5, 2017. Answers (1)
- Describe how excretion takes place in green plants(Solved)
Describe how excretion takes place in green plants
Date posted: October 5, 2017. Answers (1)
- (a)What is the function of the objective lens in a light microscope? (b)Give one advantage of using a light microscope over that of electron microscope.(Solved)
(a) What is the function of the objective lens in a light microscope?
(b) Give one advantage of using a light microscope over that of electron microscope
Date posted: October 5, 2017. Answers (1)
- Explain why excretion is necessary in plants and animals(Solved)
Explain why excretion is necessary in plants and animals
Date posted: October 5, 2017. Answers (1)
- Define the following terms: (i) Excretion (ii)Secretion (iii) Egestion (iv)Homeostasis(Solved)
Define the following terms
(i)Excretion
(ii)Secretion
(iii)Egestion
(iv)Homeostasis
Date posted: October 5, 2017. Answers (1)
- Mention the types of experiments carried out for respiration(Solved)
Mention the types of experiments carried out for respiration
Date posted: October 5, 2017. Answers (1)
- Explain the disadvantages of anaerobic respiration(Solved)
Explain the disadvantages of anaerobic respiration
Date posted: October 5, 2017. Answers (1)