The Nervous System & Co-ordination

The Nervous System & Co-ordination

1. The Nervous System consists of 2 parts

   • The Central Nervous System (CNS)
     • Brain & Spinal Cord
   • The Peripheral Nervous System
     • Nerves
   • It is composed of cells called neurons that can carry rapid electrical impulses

2. Structure of Neuron

   • specialised by being adapted to rapidly carry electrochemical changes from 1 part of the body to another

3. Types of neurons

   • Sensory
     • Conduct nerve impulses from a receptor to the CNS
   • Relay
     • Transmits impulses within the CNS
   • Motor
     • Conduct nerve impulses from the CNS to an effector such as a gland or muscle

4. Reflexes

   • Reflex arc
     • sensory neuron ->relay neuron -> motor neuroon
   • reflex action
     • reflex actions are automatic & rapid
     • the body bypasses the brain to create a quicker response