21.1 Neural system

• Coordination is the process through which two or more organs interact and complement the functions of one another
• The neural system provides an organised network of point to point connections for a quick coordination
• The neural system of all animals is composed of highly specialised cells called neurons which can detect, receive and transmit different kinds of stimuli
• The neural organisation is very simple in lower invertebrates. In hydra is composed of a network of neurons.
• The neural system is better organised in insects were a brain is present along with a number of ganglia and neural tissues
• Vertebrates have a more developed neural system