When the body temperature increases,the sweat glands increases the rate of sweat production which evaporates by absorbing latent heat of evaporation from the body resulting in a cooling effect .When the body temperature decreases there is low production of sweat resulting in retention of heat.
Low body temperature causes the erector pilli muscles to contract making the hairs to stand erect on the body surface thus trapping more air .Air is a bad conductor of heat thus insulates the body against heat loss by radiation and convection .when it is hot the erector pilli muscles relax causing the hair to lie flat thus trapping little air hence heat can be lost from the body surface.
At low body temperature blood vessels in the skin vasoconstrict thus reducing blood flow near the skin and thus prevent heat loss. At high body temperature vasodilation occurs increasing blood flow near the skin which encourages heat loss.
When the body temperature is low metabolic activities increases to enhance heat production,and when there are low metabolic activities less heat is generated.
At low body temperature shivering occurs to generate heat.
Keziahndichu answered the question on April 11, 2019 at 11:33
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A certain animal has no incisors no canine 6 premolars and 6 molars in its upper jaw.Ln the...
(Solved)
A certain animal has no incisors no canine 6 premolars and 6 molars in its upper jaw. In the lower jaw there are 6 incisors 2 canine 6 premolars and 6 molars. Write its dental formula.
Date posted:
April 10, 2019
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Answers (1)
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Describe the Darwin theory of natural selection
(Solved)
Describe the Darwin theory of natural selection.
Date posted:
April 9, 2019
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Answers (1)
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The photomicrographs below shows the male and female flowers of maize plant.
(a) With reference to the photos, describe how the flowering habit of maize encourages...
(Solved)
The photomicrographs below shows the male and female flowers of maize plant.
(a) With reference to the photos, describe how the flowering habit of maize encourages wind
Pollination
(b) In a maize plant, the anthers normally ripen before the stigmas are mature and ready to receive
pollen. This encourages cross pollination. Explain the advantages of cross pollination in plants
Date posted:
April 1, 2019
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Answers (1)
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Below is a photograph depicting interaction of organisms in a certain ecosystem(a) Name the type of ecosystem shown.(b) (i) Name any three living organisms you...
(Solved)
Below is a photograph depicting interaction of organisms in a certain ecosystem
(a) Name the type of ecosystem shown.
(b) (i) Name any three living organisms you can observe in the photograph in order of their
trophic levels
(ii) What feeding relationship is exhibited by the animals shown in the photograph
(c) (i) Give three adaptations of each animal regarding the feeding relationship mentioned in b (ii)
above
(ii) Draw a simple food chain to represent the food relationship in the ecosystem shown in the
photograph.
Date posted:
April 1, 2019
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Answers (1)
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The diagram below represents a structure found in one of the labelled parts of the gut. Study it
and answer the questions that follow.
(i) Name the...
(Solved)
The diagram below represents a structure found in one of the labelled parts of the gut. Study it
and answer the questions that follow.
(i) Name the structure.
(ii) State its function
(iii) Name each of the vessels marked X and Y
(iv) State two ways in which the structure is adapted to its functions
Date posted:
April 1, 2019
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Answers (1)
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Explain why images that form on the blind spot are not perceived.
(Solved)
Explain why images that form on the blind spot are not perceived.
Date posted:
April 1, 2019
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Answers (1)
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How does the human eye obtain nutrients
(Solved)
How does the human eye obtain nutrients
Date posted:
April 1, 2019
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Answers (1)
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In humans a certain rare sexlinked recessive allele results in a disorder of the iris. This condition is
known as cleft iris. Using letters B and...
(Solved)
In humans a certain rare sexlinked recessive allele results in a disorder of the iris. This condition is
known as cleft iris. Using letters B and b, show all the possible genotypes of the children of a man
with a cleft iris and a woman who has only the normal allele.
Date posted:
April 1, 2019
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Answers (1)
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Name the hormones involved in the regulation of glucose level in the blood.
(Solved)
Name the hormones involved in the regulation of glucose level in the blood.
Date posted:
April 1, 2019
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Answers (1)
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What is the role of canine tooth during digestion in the mouth?
(Solved)
What is the role of canine tooth during digestion in the mouth?
Date posted:
April 1, 2019
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Answers (1)
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Name the features that increases the surface area of the small intestines.
(Solved)
Name the features that increases the surface area of the small intestines.
Date posted:
April 1, 2019
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Answers (1)
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Name one process that is responsible for loss of energy from one trophic level to the next.
(Solved)
Name one process that is responsible for loss of energy from one trophic level to the next.
Date posted:
April 1, 2019
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Answers (1)
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The diagram below shows a vertical section through a flower.
(a) Name the parts marked X and Y.
(b) Suggest the agent of pollination for the flower.
(c)...
(Solved)
The diagram below shows a vertical section through a flower.
(a) Name the parts marked X and Y.
(b) Suggest the agent of pollination for the flower.
(c) Give a reason for your answer in (b) above.
Date posted:
April 1, 2019
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Answers (1)
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Differentiate between chiasmata and centromere.
(Solved)
Differentiate between chiasmata and centromere.
Date posted:
April 1, 2019
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Answers (1)
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State two functions of oestrogen hormone in a female human being during menstrual cycle.
(Solved)
State two functions of oestrogen hormone in a female human being during menstrual cycle.
Date posted:
April 1, 2019
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Answers (1)
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Form one students set an experiment shown below to investigate a certain physiological process.
The set up was left for 30 minutes.
(a) Name the process under...
(Solved)
Form one students set an experiment shown below to investigate a certain physiological process.
The set up was left for 30 minutes.
(a) Name the process under study.
(b) State the expected results.
(c) Explain your answer in (a) above.
Date posted:
April 1, 2019
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Answers (1)
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State two disadvantages of external fertilization in amphibians.
(Solved)
State two disadvantages of external fertilization in amphibians.
Date posted:
April 1, 2019
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Answers (1)
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Give Five examples of synthetic biology applications.
(Solved)
Give Five examples of synthetic biology applications.
Date posted:
March 28, 2019
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Answers (1)
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Explain the term Synthetic biology.
(Solved)
Explain the term Synthetic biology.
Date posted:
March 28, 2019
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Answers (1)
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Give FOUR harmful viral diseases attacking human beings.
(Solved)
Give FOUR harmful viral diseases attacking human beings.
Date posted:
March 28, 2019
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Answers (1)