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Outline how nerve impulses are transmitted along a nerve fibre.

1. Sodium (voltage-gated) channels open and Na + diffuse into neuron (down concentration gradient). 2. Inside of neuron becomes positive compared to the outside, so potential is reversed = depolarization. 3....
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Answered by Paulina W. • Biology tutor
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Explain the process of inhalation

Inhalation is the process of breathing air into the lungs through the nose and mouth. This causes an increase in the volume of air in the lungs, meaning the pressure will decrease. This is acheived using 3 s...
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Answered by Florence Z. • Biology tutor
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How are leaves of a plant adapted to enable photosynthesis?

Leaves have 4 main adaptations which enable them to carry out photosynthesis successfully. 1) Thin - this allows carbon dioxide to easily diffuse into the leaf cells 2) Transparent epidermis - this allows li...
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Answered by Rebecca G. • Biology tutor
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Explain what is meant by 'homeostasis' and give an example of this process in the human body.

Homeostasis is the process of maintaining a constant internal environment in the body. An example of this is maintaining the temperature of the body. Human body temperature must be maintained at 37ºC as this...
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Answered by Oli W. • Biology tutor
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What is 'survival of the fittest?'

1. What is ‘survival of the fittest’? - ‘Survival of the fittest’ is a phrase way to describe the principle behind the theory of evolution by natural selection, originally proposed by Charles Darwin in 1859 ...
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Answered by Radoslaw K. • Biology tutor
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