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Reflex PowerPoint Presentation

Reflex

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Reflex

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  1. Reflex • Reflex – rapid, predictable, and involuntary responses to stimuli • Ex: jerking your hand away from a hot stove

  2. Types of Reflexes and Regulation • Autonomic reflexes • Regulate activity of the smooth muscles, heart, & glands; digestion, elimination, blood pressure, sweating, etc. • Ex: secretion of saliva, change in pupil size

  3. Types of Reflexes and Regulation • Somatic reflexes • Activation of skeletal muscles • Ex: patellar reflex

  4. Reflex Arc • Reflex arc – one way neural pathways that reflexes occur over

  5. Reflex Arc Sensory receptor: reacts to stimulus Afferent (sensory) neuron: sends message to CNS Association neuron: integration center - decides what to do Efferent (motor) neuron: sends message from CNS Effector organ: muscle or gland stimulated

  6. Simple Reflex Arc

  7. Do all reflexes require the same amount of time to happen? ------------------------------------------------ No - the more synapses there are in a reflex pathway, the longer the reflex takes.

  8. Can reflexes occur without the brain? Explain. ------------------------------------------------ Yes, many involve only the spinal cord neurons

  9. Explain the purposes of reflexes. ------------------------------------------------ Protection and to augment body processes such as digestion & excretion

  10. Why is reflex testing important? ------------------------------------------------ It helps to evaluate the condition of the nervous system. Problems with reflexes can indicate the presence of a nervous system disorder.

  11. Review - Types of Reflexes. ------------------------------------------------ A. somatic B. autonomic A. somatic B. autonomic A. somatic B. autonomic B. autonomic

  12. Review - Figure 7-2 ------------------------------------------------ Stimulus = pin prick Effector = skeletal muscle Synapses = two (three if you count the muscle)