6.2.1 Neurones
Cards (14)
- Neurone = specialised cells that are adapted to rapidly carry nerve impulses
- Mylein SheathA) Schwann CellB) AxonC) Node of Ranvier
- Cell Body = contains nucleus and large amounts of RER. Associated with production of proteins and neurotransmitters
- Dendrons = branching extensions of the axon that carry impulses towards the cell body
- Axon = the long extension of a neuron that carries nerve impulses away from the cell body.
- Schwann Cells = surrounds axon, providing electrical insulation and protection; can also carry out phagocytosis and play a role in nerve regeneration
- Mylein Sheath = formed of membranes of Schwann cells; lipid rich
- Nodes of Ranvier = gaps between myelin sheaths in axon
- Sensory neurone = neurone that carries impulses from the receptors to the motor/relay neurone
- Motor Neurone = a neurone that carries impulses from the relay neurone to the effector organs
- Motor Neurones have a long axon and short dendrites
- Sensory neurones have long dendron and short axon.
- Relay neurone = a neurone that connects sensory neurones to motor neurones
- Type of NeuroneA) Sensory NeuroneB) Motor NeuroneC) Relay Neurone