BIO1022 Lecture Notes - Lecture 4: Schwann Cell, Cell Membrane, Axon Terminal

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Lecture 5 (10/8): Nervous System “Signals and Synapses”
Endocrine system
· Transmission of chemicals around the body
· They are output everywhere
· Transferred around the body in the blood stream
· Slow, long lasting (days)
Nervous system
· Electrical ‘a network of cables’
· Fast and short in signally capacity (fractions of a second – milliseconds)
· Information processing
o Sensory input
o Integration
o Motor output
Neurons – Information conducting cells
· Chemical signals
· Electrical signals
· Connections
Glia – Supporting cells
· Brain
· They provide structure and protection and in case the neurons, blood brain barrier, they provide a
barrier that separates the blood from the brain
· Metabolism
· Insulation:
Central nervous system (CNS)
· Information in the nervous system is integrated
· Bringing various sources of information
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Document Summary

Lecture 5 (10/8): nervous system signals and synapses . Transferred around the body in the blood stream. Fast and short in signally capacity (fractions of a second milliseconds) Information processing: sensory input, integration, motor output. They provide structure and protection and in case the neurons, blood brain barrier, they provide a barrier that separates the blood from the brain. Information in the nervous system is integrated. Sensory neurons (ganglia: responsive to stimuli, eg; salamander (chordate) Three stages: sensory input: vision, integration: brain/spinal cord, motor output: leg muscle. Sensory neuron: have dendrites: sensitive to stretch, pressure, a cell body located on the right of the dendrites: spinal cord, axon terminals: associated with other neurons. Interneuron: integration of information to take place, cell body is located in the head of the neuron * main difference , a long axon. Motor neuron: connects to muscles, leads to muscle contraction, schwann cells (predominately lipid) located within the axon.

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