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Module 1: Sistema nervioso

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Comparación de nervio y Control Hormonal en vertebrados

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Biology - Comparison of Nerve and Hormonal Control in Vertebrates

Comparison of Nerve and Hormonal Control in Vertebrates

FEATURE
NERVOUS CONTROL
HORMONAL CONTROL

Speed of travel
Rapid (fractions of a second)
Slow (seconds, minutes)

Method of transmission
Action potential along nerves;
chemical transmission across synapses Chemical substance (messenger)
released into circulatory system to all parts of the body; may travel long
distances

Target
Specific destination eg.
a muscle or gland Widespread distribution but target is specific to the
hormone; a particular hormone may affect cells in several target organs

Duration of response
Immediate, short-lived
Temporary (few seconds or minutes), e.g. adrenalin; or long-lasting,
e.g. pituitary hormones affecting growth and mental ability over years

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