Coordinators

COORDINATORS 1. NERVOUS SYSTEM The nervous system is a complex structure of nerves of neurons that transmit signals around the body to coordinate actions. In invertebrated living beings: it is very simple. Nervous net and ganglion system (jellyfish, grasshooper)In vertabrated living things: Central nervous system: brain and spinal cordPeripheral nervous system: nerves.The brain is protected by the skull, and the spinal cord by the skeletal vertebrae.Nerves can be:Sensory nerves: change light, touch and sound into neural signals which are sent back to our CNS to help our body understand and react to its surroundings.Motor nerves: transmit neural signals to activate muscles or glands. The nervous system can transmit signals at speeds of 100m/s.