the nervous system - divisions of the nervous system...
TRANSCRIPT
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• The Nervous System
- Divisions of the nervous system
- Cells of the nervous system
- Neuron structure and function
• Intro to Psychological Health and Social
Connections (Ch 2, 3)
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The Nervous System • CNS – brain & spinal cord
• PNS – connects CNS to other parts of the body
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CNS: The Brain • Protected by the skull and three meninges
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The brain is divided into forebrain,
midbrain, and hindbrain • Forebrain: “Central processor”, thinking, language,
motor function, thirst, hunger, temp. control
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• Midbrain: Vision, hearing, motor control
• Hindbrain: Balance, coordination,
breathing, heart rate, digestion
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CNS: The Spinal Cord
• Conducts signals between PNS and brain
• Control center for simple reflexes
• Protected by spine
spinal cord
vertebra
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Components of PNS
• Somatic: Carries
signals to and from
skeletal muscles in
response to external
stimuli
• Autonomic: Regulates
internal environment by
controlling smooth and
cardiac muscle
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Divisions of Autonomic System • Sympathetic: “Fight or Flight”
• Parasympathetic: “Rest and Digest”
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Cells of the Nervous System
• Neurons: Transmit
messages
• Glia: Support and
protect neurons,
maintain ion balance
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3 Basic Types of Neurons
• Sensory neurons –
collect and relay info
• Interneurons –
receive and process
info
• Motor neurons – relay
signals to muscles
and glands
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Parts of a Neuron
dendrites input zone
cell body
trigger zone
conducting zone
axon axon endings
output zone
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• Outer membrane of neuron regulates the
passage of ions into and out of the cell
Na+ K+
K+ Na+
outside
plasma membrane
inside
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Resting Potential
• Neuron not transmitting signal (“at rest”)
• Cytoplasm inside neuron has slight negative charge as compared to fluid outside the cell
fluid outside cell
cytoplasm -
+
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Action Potential • Signal received, spreads to trigger zone
• Sodium gates open, Na+ rushes in
• Cytoplasm becomes positive as compared to fluid outside (charges reverse)
gated sodium channel Na+
Na+ Na+
voltage reversed
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• Action potential then travels down plasma
membrane away from trigger zone
K+ K+
K+
Na+
Na+ Na+
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Sodium / Potassium Pump • Uses energy to restore the resting potential
• 3 Na+ pumped out for every 2 K+ pumped in
• Cytoplasm becomes negative again
Na+/K+ pump
Na+
Na+
Na+
K+
propagating action potential
Na+ Na+
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How does an action potential move
from one neuron to another?
• Neurotransmitters
(chemical signals)
diffuse across a
synapse (gap)
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Psychological Health & Social Connections
(Chapters 2 & 3)
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The Maslow Pyramid
Fig 3.1, pg 42
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Positive Psychology
• Idea that everyone, regardless of genes or fate, can achieve a happy, gratifying, meaningful life
What
determines
happiness?
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How to gain and maintain happiness?