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GCSE Biology-
Nervous and Plan
Co-ordination
Pearson Edexcel IGCSE
, BIOLOGY GCSE –CO
Contents
q Structure of the Nervous System –
q The Nervous System –
q Neurons –
q The System –
q Reflex Arcs –
q Synapses –
q The Brain & Cerebrum –
q Structure of the Eye –
q Functions of the Eye –
q Eye Defects –
q Plant Co-ordination –
q Tropisms –
q Role of Auxin –
Structure of the Nervous System
PROPERTY ENDOCRINE SYSTEM NERVOUS SYSTEM
Type of Message Chemical message Electrical message
How is it transmitted Transmitted in the blood stream ( in Through nerves
blood vessels)
Speed of Transmission Quite slow dependent on the blood Very quick, due to it being an
flow message
Speed of Effect Takes longer to act Very fast, almost instantly, drop
finger and hurts immediately
Length of response Long lasting response Short response, pin example on
about 30 seconds to a minute
Target Tissue/organ Different organs and tissues ( have to muscles or glands are target or
have the correct receptor, can’t just tissues
go anywhere)
Spread of the effect Widespread through different parts of Only affects specific organs, al
the body with receptors somewhere specific and are
localised unlike hormones whic
travel anywhere through the b
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