Robert Hooke observed that the cork resembled the structure of a honeycomb, consisting of many little compartments.
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The combination of nerve and muscle tissue is fundamental to most animals because it enables them to move rapidly in response to stimuli.
The signal that passes along the nerve fibre is called a nerve impulse. It enables communication between nerve cells and controls muscle movement and responses.
An individual nerve cell may be up to a metre long.
The two main types of processes that arise from the neuron’s cell body are a single long part called the axon and many short, branched parts called dendrites.