EXSS 155; 8D reflex arcs

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6 Terms

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What is a reflex

  • Fast, predictable, automatic response to help maintain homeostasis

  • Simplest type of pathway

  • Level of brain involvement varies

  • How ANS operates

  • Born with some but can also learn reflexes

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Gray v white matter

  • Gray: where integration for reflexes happens

  • White: highways for impulse propagation

3
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What are necessary components of reflexes

  • Receptor

  • Sensory neuron

  • Motor neuron

  • Effector

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What do sensory receptors in muscles do?

  • Senses muscle length

  • Report stretching to CNS

  • Reflex: Muscles contract to resist further stretching

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Receptors in golgi tendon organs (GTO) muscle

  • Sense changes in muscle tension

  • Located close to tendon and muscle attachment

  • Reflex: inhibit agonist muscle (too stretched) contraction, excite antagonist muscle to prevent injury

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Types of sensory receptors

  • Mechanoreceptors: respond to mechanical forces

  • Thermoreceptors: respond to temp changes

  • Photoreceptors: respond to light (allow for vision)

  • Chemoreceptors: respond to chemical stimuli

  • Osmoreceptors: respond to change of osmotic pressure in bodily fluids