A2 Biology Chapter 2
- Created by: Chloesn
- Created on: 16-09-14 20:11
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- Chapter 2 Nerves
- Central nervous system
- Nerves
- Neurones
- Action potentials
- Peripheral nervous system
- Neurones
- Brain and spinal cord
- Nerves
- Myelin
- Schwann cells
- Wrapped around axon
- Myelin sheath
- 1/3 of motor and sensory
- Increases speed of conduction
- Uncovered gaps
- Nodes of Ranvier
- 1-3mm
- Nodes of Ranvier
- Schwann cells
- A reflex arc
- Pathway which impulses are carried
- receptor to effector
- No conscious thought
- receptor to effector
- Impulse arrives along sensory neurone
- Through dorsal root ganglion
- Into spinal cord
- Directly to motor neurone
- Impulse sweeps along axon
- Arrives at effector
- Response can be rapid
- Reflex action
- Avoid danger
- Reflex action
- Response can be rapid
- Arrives at effector
- Impulse sweeps along axon
- Or intermediate neurone then
- Directly to motor neurone
- Impulse sweeps along axon
- Arrives at effector
- Response can be rapid
- Reflex action
- Avoid danger
- Reflex action
- Response can be rapid
- Arrives at effector
- Impulse sweeps along axon
- Directly to motor neurone
- Directly to motor neurone
- Into spinal cord
- Through dorsal root ganglion
- Pathway which impulses are carried
- Structure of a nerve
- Axons almost always in bundles
- Protective covering - perineurmium
- Sensory nerves
- Motor nerves
- Mixed nerves
- Axons almost always in bundles
- Transmission
- Electrical signals
- Rapid
- Brief changes in electrical charge distibution
- Across plasma membrane
- Electrical signals
- Synapses
- Eels
- Neurones
- Motor neurone
- Action potentials from CNS to effector
- Muscle or gland
- Cell body lies in spinal cord or brain
- Dark specks - ribosomes
- Impulse towards cell body
- Cytoplasmic processes extend - dendrites
- Impulses away from cell body
- Longer one - axon
- Action potentials from CNS to effector
- Transmitter
- Sensory nerounes
- Impules via dendrons
- From sense organs
- Impules via dendrons
- Intermediate neurones
- Or relay
- Cytoplasmic processes inside brain/spinal cord
- Impulses from and to other neurones
- Motor neurone
- Central nervous system
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