The Nervous System

• Afferent neuron

• To carry impulses from a sense organ to the central nervous system

• Efferent neuron

• Carry impulse from central nervous system to a muscle or gland

• Carry messages between sensory and motor neurons

• A group of cells that detect a stimulus

• Carry's out a response

• Makes neurotransmitters

contains nucleus and mitochondria

• Control centre of the neuron

• Carry impulses towards cell body

• Highly branched

• Carry impulses away from the cell body

Remember - Axons = Away

• Make the myelin sheath

• Speeds up electrical impulse
• Insulates electrical impulse

• Fat

• Release neurotransmitters to carry electrical impulse across synapse

• Causes vesicles to secrete neurotransmitters

• Cell Body

• By means of diffusion

• An electrical impulse travels into neurotransmitter swellings
• This causes vesicles to secrete neurotransmitters such as dopamine
• These neurotransmitters travel across the synapse by means of diffusion

• In the dendrites

• Towards the cell body of post synaptic neuron

• Digested by enzymes to be recycled and used again

• Neurotransmitters combine with the dendrites of the post synaptic neuron
• The impulse is carried towards the cell body
• Neurotransmitters are then digested by enzymes to be recycled and used again

• Acts as a shock absorber
• Contains nutrients for nourishing

Controls:

• Thinking
• Intelligence
• Language
• Emotions
• Memory

Controls :

• Muscle co-ordination
• Balance

• Highly folded

Controls :

• Breathing
• Coughing
• Sneezing

• Spinal cord with the brain

• Sorting centre of the brain

• Below cerebrum but above hypothalamus

Controls :

• Temperature
• Blood pressure