BB 2019 Fall Chapter 15(1).ppt - ANATOMY PHYSIOLOGY Chapter 15 THE AUTONOMIC NERVOUS SYSTEM Figure 15.1(credit Vernon Swanepoel Fight or Flight Though

BB 2019 Fall Chapter 15(1).ppt - ANATOMY PHYSIOLOGY Chapter...

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ANATOMY & PHYSIOLOGY Chapter 15 THE AUTONOMIC NERVOUS SYSTEM
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Figure 15.1 (credit: Vernon Swanepoel) Fight or Flight? Though the threats that modern humans face are not large predators, the autonomic nervous system is adapted to this type of stimulus. The modern world presents stimuli that trigger the same response.
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Organization of the Nervous system Central Nervous System Autonomic Nervous System (chapter 15) Sympathetic Parasympathetic Somatic Nervous System (chapter 14) Sensory Motor Brain Spinal Cord Peripheral Nervous System
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Organization of the Nervous system Central Nervous System Autonomic Nervous System (chapter 15) Sympathetic Parasympathetic Somatic Nervous System (chapter 14) Sensory Motor Brain Spinal Cord Peripheral Nervous System
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Nervous System Overview CNS consists of brain and spinal cord CNS is link between sensory and motor subdivisions of PNS PNS consists of cranial and spinal nerves CNS communicates with body via cranial and spinal nerves Sensory/afferent – brings info from receptors to CNS Motor/efferent – carries signals away from CNS to effector muscles and glands PNS “motor division” divided into two major categories
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Nervous System Overview Two major categories of PNS “motor division” Somatic Voluntary Controls skeletal muscle Autonomic Involuntary Controls smooth muscle, cardiac muscle, and glands Subdivided into: Parasympathetic – mediates “rest and digest” reactions Sympathetic – mediates “fight, flight, and stress” reactions
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Overview of the Autonomic Division The autonomic nervous system (ANS) is important for homeostasis and regulates organs and organ systems & their smooth muscles & glands Sensory information is sent to CNS. After integration, CNS coordinates response and sends message via efferent division
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The Autonomic Division ANS sympathetic and parasympathetic divisions usually have antagonistic effects called – dual antagonistic innervation Example – pupil of eye Parasympathetic – constricts Sympathetic – dilates Example – heart Parasympathetic – slows heart rate
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  • Fall '16
  • Dusti Sloan

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