Chapter 3: Nervous System PDF

Chapter 3: Nervous System EXS-210 Dr Michelle “Twitch” Jilek, PT, DPT, OCS, CSCS Nervous System 1 of 2 primary control centers Other is endocrine Nervous System is quick (fractions of seconds) Voluntary and involuntary actions It...

Chapter 3: Nervous System EXS-210 Dr Michelle “Twitch” Jilek, PT, DPT, OCS, CSCS Nervous System 1 of 2 primary control centers Other is endocrine Nervous System is quick (fractions of seconds) Voluntary and involuntary actions It’s electric Central & Peripheral components Central = brain and spinal cord Sensory and motor Peripheral = neurons, motor end plates, sensory receptors on sensory organs Autonomic Nervous System Sympathetic and parasympathetic systems Component of motor PNS Central & Peripheral Nervous System CNS PNS (everything else) (Afferent) (Efferent) Sensor y Affere nt Motor Efferen t  Se y ns or Aff nt ere Mo Afferent Neurons E tor ff the brain and spinal Nerves that carry electric impulses toward ere cord t n Sensory Efferent Neurons Nerves that carry electric impulses away from the brain and spinal cord Motor Somatic Part of the nervous system that controls voluntary action Autonomic Part of the nervous system that regulates involuntary action Peripheral Nervous System Sensory (afferent) Stuff you feel Skin, pain, bellyache, itch, hot, cold, vibration, etc “bo dy” in G ree k Motor (efferent) Stuff you do Voluntary (somatic) Involuntary (autonomic) Motor neurons go to skeletal muscle (voluntary) to do an action Motor like locomotion, movement Autonomic Nervous System (ANS) Component of motor in PNS Also sometimes called the Visceral component Sympathetic and Parasympathetic Smooth muscle, cardiac muscle, glands Without any input, heart beats at approx. 100bpm There is always some component of symp/para at play Sympathetic Fight or flight, fight sabertooth tiger Faster HR, bronchodilation, pupil dilation, no digestion, vasoconstriction, increase BP, adrenaline and norepinephrine get released Stress, nervous, workouts Parasympathetic Rest & digest Slower HR, bronchoconstriction, pupil constriction, digestion, vasodilation, decrease BP Sleep, relaxation, meditation How the nervous system relates to exercise/performance  Neurological disorders and exercise ercise is THE BEST thing you can do for the brain (high quality research shows)  Your Brain on Exercise When you work out… Endorphins released (feel-good hormones) Can work as an effective anti-depressant for some people “runner’s high” My mu o = Myokines scl e ”Hope” molecules Released by skeletal muscle when you exercise Muscle-organ cross-talk Crosses blood-brain barrier Helps other parts of the body become stronger and healthier Emerging research