i)Long axon (Up to 1 m in man, longer in other animals allowing fast, uninterrupted flow of nerve impulses);
ii) Myelin sheath (40% water, 70- 80% lipids, 15-30% proteins) round the neurone serves as an insulator: Prevents leakage of the
nerve impulse out of the axon
johnmulu answered the question on January 18, 2017 at 08:21
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A constant supply of oxygen is necessary for plants to efficiently absorb dissplved mineral salts from soil
(Solved)
A constant supply of oxygen is necessary for plants to efficiently absorb dissplved mineral salts from soil. Explain
Date posted:
January 17, 2017
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Answers (1)
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Which feeding structure prevents oxygenated and deoxygenated blood from mixing inside the mamalian heart
(Solved)
Name the structure which prevents oxygenated and deoxygenated blood from mixing inside the mammalian heart.
Date posted:
January 17, 2017
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Answers (1)
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Name one factor that is maintained at a relatively constant level in the body by the following organs
(Solved)
Name one factor that is maintained at a relatively constant level in the body by the following organs
i) Liver
ii) Skin
iii) Kidneys
Date posted:
January 17, 2017
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Answers (1)
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Homeostasis is defined as "the maintenance of a stable internal environment" in the body.
(Solved)
Homeostasis is defined as "the maintenance of a stable internal environment" in the body. What is meant by the expression "internal environment"?
Date posted:
January 17, 2017
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Answers (1)
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Explain why when using an electron microscope to study specimens
(Solved)
Explain why when using an electron microscope to study specimens
(a) The images formed are viewed either on a fluorescent screen or photographic plates.
(b) It is not possible to observe living materials
Date posted:
January 17, 2017
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Answers (1)
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Name two strengthening tissues in plants other than xylem
(Solved)
Other than xylem tissue, name two strengthening tissues in plants.
Date posted:
January 17, 2017
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Answers (1)
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Name the main mineral elements obtained from insects by insectivorous plants
(Solved)
Name the main mineral elements obtained from insects by insectivoros plants
Date posted:
January 16, 2017
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Answers (1)
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State two factors within the seed that cause seed dormancy
(Solved)
Which factors within the seed that cause seed dormancy?
Date posted:
January 16, 2017
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Answers (1)
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Name the ground material of each of the following organelles
(Solved)
Name the ground material of each of the following organelles:
a) Chloroplast
b) Nucleus
c) Mitochondrion
d) Plant cell vacuole
Date posted:
January 16, 2017
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Answers (1)
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Explain why only mutations in the genes of gametes can influence evolution
(Solved)
Explain why only mutations in the genes of gametes can influence evolution.
Date posted:
January 16, 2017
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Answers (1)
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What type of evolution produces analogous structures?
(Solved)
Name the type of evolution that produces analogous structures
Date posted:
January 16, 2017
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Answers (1)
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Name two important functions of fruits to the life cycle of plant
(Solved)
What are the important functions of fruits to the life cycle of plant?
Date posted:
January 16, 2017
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Answers (1)
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What is name given to addition of a dye to specimen during the preparation for viewing under the light microscope?
(Solved)
Addition of a dye to specimen during the preparation for viewing under the light microscope is called
Date posted:
January 16, 2017
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Give one living cell in the plant and in the animal body that, when mature, lacks a nucleus
(Solved)
Name one living cell in the plant and in the animal body that, when mature, lacks a nucleus.
Date posted:
January 16, 2017
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Answers (1)
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What is the role of air in a germinating seed?
(Solved)
What is the role of air in a germinating seed?
Date posted:
January 16, 2017
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Answers (1)
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What are the advantages of metamorphosis to the life of insects?
(Solved)
Give two advantages of metamorphosis to the life of insects.
Date posted:
January 16, 2017
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Answers (1)
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What is the difference between homologous and analogous structures?
(Solved)
Give the difference between homologous and analogous structures.
Date posted:
January 16, 2017
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Answers (1)
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Name two respiratory surfaces in a mature frog apart from the lungs
(Solved)
Name two respiratory surfaces in a mature frog apart from the lungs.
Date posted:
January 16, 2017
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Answers (1)
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What is the effect of denitrifying bacteria in the soil?
(Solved)
Give the effect of denitrifying bacteria in the soil.
Date posted:
January 16, 2017
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Answers (1)
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Where does nitrogen fixation take place in a plant?
(Solved)
Name the part of plant where nitrogen fixation takes place.
Date posted:
January 16, 2017
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Answers (1)