Electric impulses are fast but they cannot reach every cell of the animal body. Which mechanism helps the animal to cmmunicate with the main cells? Give its two advantages.

Asked by  | 24th Aug, 2010, 12:48: PM

Expert Answer:

The main cells of the body are able to communicate with each other via the neurons and neurotransmitters.
An excitatory neurotransmitter passes the message on by creating an electrical impulse in the cell that receives it, and the process of electrical-to-chemical signaling is repeated. But if an impulse were to be transmitted to every neuron in the brain, the result would be chaos; much like a power surge can cause a short circuit, neurons firing all at once would cause a prolonged epileptic seizure. To safeguard against this happening, inhibitory neurotransmitters suppress communication to neighboring neurons.
Of the more than 20 chemical messengers discovered thus far, a few are fairly well understood. Several of them are involved in memory, including acetylcholine, serotonin, and dopamine. Many of these neurotransmitters have additional functions; for example, serotonin helps regulate sleep and sensory perception, while dopamine helps regulate movement.

Answered by  | 24th Aug, 2010, 08:02: PM

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