pp3.docx - Spinal Cord Cables of neurons o Carries signals...

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Spinal Cord Cables of neurons o Carries signals from the brain to muscles and glands (periphery o Carries sensory information form the periphery (sense organs) to the brain o "Hub" for reflex arcs (neural pathways that produce reflex acts ) Reflex Arc: Neural pathway that controls a reflex act Reflex Act: Simple, automatic response to a sensory stimulus (Response--> Muscle contraction or gland secretion) Spinal Cord & Spinal Column *** Know the difference Blood-Brain Barrier ---> Prevents harmful substances (toxins) from entering the brain Capillary membrane cells so tightly packed together that they form a barrier to most molecules Fat soluble substances feely pass through the barrier o Psychiatric Medications and other drugs Other substances use special transport proteins to get through (amino- acids, glucose) Some areas of the brain are not protected by blood-brain barrier o The area postrema (in Medulla) - induces vomiting when certain toxins are in bloodstream Nervous System
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  • Spring '13
  • Psychology, blood-brain barrier, sensory information form, reflex act

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