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OCR A level Biology Notes - All of Year 2
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All of A level OCR Biology year 2 notes. In depth notes which has prepared me to get A*. Includes all of module 5 and 6 in an easy to understand way.
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2 reviews
By: hannahgrice4 • 4 year ago
good, straight to the point summarised notes
By: samreenhalani • 4 year ago
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Module 5 – Chapter 14 Neuronal CommunicationNeurones
Neurone -Specialised cell which transmits impulses in action potentials
The role of a neurone is to transmit electrical impulses rapidly around the body
Structure of a Neurone
• Cell body – Contains the nucleus surrounded by cytoplasm. There is endoplasmic reticulum and
mitochondria which make neurotransmitters.
• Dendrons – Short extensions which come from the cell body, they divide into smaller branches called
dendrites and are responsible for transmitting electrical impulses towards the body
• Axons – Elongated nerve fibres that transmit impulses away from the body.
Types of neurone
Sensory neurone – Transmit impulses from sensory receptors in the cell to a relate, or motor neurone.
One dendron
Relay neurone - Transmit impulses between neurones, short axons and dendrons
Motor neurones – Transmit impulses from a relay neurone or sensory neurone to an effector, long
axon and short dendrites
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