Biophysical dimension

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Author:
lindasun
ID:
275944
Filename:
Biophysical dimension
Updated:
2014-06-02 14:04:47
Tags:
ch2
Folders:
exam1
Description:
ch2
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  1. central nervous system (CNS)
    brain and spinal cord
  2. Peripheral Nervous System (PNS)
    • made of nerves that relay messages between CNS and body's sensory organs, muscles and glands.
    • two parts: somatic and autonomic
  3. somatic nervous system (SNS)
    governs voluntary activites
  4. Autonomic nervous system (ANS)
    • primarily involuntary activities, but biofeedback, and hypnosis show they can have some voluntary control 
    • divided into two parts: sympathetic and parasympathetic branches
  5. Sympathetic branch
    • of autonomic nervous system
    • arousal and expenditure of engergy
    • ex. fight for flight: reaction to a threat causes dilation of pupils, dry mouth, inhibition of perstalsis, sweating, increased blood pressure and heart rate
  6. parasympathetic branch
    • conservation of energy
    • active during digestion and periods of rest adn relaxation
    • biofeedback activates the parasympathetic branch
  7. neuron
    • nerve cell involved in mental processes and behavior
    • consists of dendrites, cell body (soma) and axon
  8. axon
    • part of neuron
    • trasmits info to other cells
    • covered in myelin sheath which insulates and speeds up conduction of nerve impulses
  9. neruotransmitter
    this is released by nerve impulses into the synapse (gap between neurons)
  10. 6 types of neurotransmitters
    • acetylcholine (ACh)
    • catecholamines: norepinephrine, epinephrine (adrenaline), dopamine
    • serotonin
    • gamma-aminobutyric acid (GABA)
    • glutamate
    • endorphins
  11. Acetylcholine (ACh)
    • causes muscles to contract and involved in memory
    • Alzheimer's dementia- deterioration of ACh in brain
  12. Catecholamines
    • norepinephrine- noradrenaline, epinephrine- adrenaline, dopamine- regulation of movement: all involved in personality, mood, memory and sleep
    • Depression- low levels of norepinephrine and dopamine
    • schizophrenia and tourette's syndrome- excessive activity at dopamine synapses
    • Parkinson's disease- degenerations of dopamine receptors cause tremors
    • stimulant drugs (opiates, alcohol, nicotine)- elevated levels of dopamine

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