Ch. 5 Notes - Defining and Measuring Stress

Ch. 5 Notes - Defining and Measuring Stress - Chapter 5...

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Chapter 5 Notes: Defining and Measuring Stress Nervous System Basic function is to integrate all the body's systems Our internal communicator Relay info to & from the environment Neurons Neurotransmitters Synaptic cleft Sensory neuron (afferent) Motor neurons (efferent) 2 Major divisions of the nervous system Central nervous systematical brain and spinal cord Peripheral nervous systematical All other neurons in the body Neurons Our nervous system is compromise of billions of cells or neurons Types of neurons in Peripheral nervous systematical Sensory neurons (afferent neurons) Relay info from sense organs toward the brain Motor neurons (efferent) Relays information from the brain to muscles and organs Synaptic Cleft (Not a neuron) Space between neurons where neurotransmitters are released that excites or inhibits the next neuron from firing. The action of neurons is electrochemical Within each neuron are electrically charged ions, these ions hold the potential for an electrical discharge This discharge is a minute electrical current, the electric current travels the length of the neuron Electrical discharge leads to the release of neurotransmitters (NT) into the synaptic cleft Neurotransmitters Neurotransmitters (NT) = Chemicals manufactured within each neuron Stored at the tos of neurons Diffuse across the synaptic cleft upon electrical discharge 2 Types of NT Excitatory NT – Promote the activation of neurons Inhibitory NT – Make neurons more difficult to activate Peripheral Nervous System
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  • Fall '08
  • Mallory
  • Neurons Neurotransmitters Synaptic, brain Motor neurons, systematical Sensory neurons, neurons Inhibitory NT

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