7.THE NERVOUS SYSTEM

Neurons are similar in all animal vary in complexity .More complex organisms have  complex nervous systems and more neurons  enables faster  complex precise behaviour 

SYSTEMS OF COORDINATION

Animals have two systems for coordinanting and regulating their life functions:the two work closely together.

Nervous system.Consists of specialized cells called neurons.Neurons transmit information as nerve impulses.The impulses travel along the branches of the neuron which form cords called nerves.

THE FUNCTION OF INTERACTION: RECEPTORS

Interaction is the life function which enables living things to capture information called stimuli. The stimuli lead to a response in the living thing. Produce a response, several different structures are necessary.