Nerves And Synapses

Question 1

What are the 2 parts the nervous system consists of?

Answer 1

• The central nervous system
• The peripheral nerves

Question 2

What are neurons?

Answer 2

Cells that make up the nervous system that can carry electrical signals at high speed

Question 3

What are the structures that make up a mammalian motor neuron?
(Listed in order of transmission of impulse)

Answer 3

• Dendrites
• Nucleus
• Cell body
• Axon (nerve fibre)
• Myelin sheath (composed of Schwann cells)
• Nodes of Ranvier
• ## Motor end plates (form junctions with muscle fibres)

Question 4

What is the Myelin Sheath?

Answer 4

The fatty Myelin Sheath around the axons of nerve cells in vertebrates, acts as an electrical insulator
- gaps in the middle of the Myelin Sheath called The Nodes of Ranvier