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Reflex Arcs

Reflex Arcs. Nerve impulse pathways that are responsible for involuntary actions Look like the pathway you drew and labeled: Receptor to Sensory neuron to (optional step) Interneurons in the CNS (a reflex center) to Motor neurons to Effector. Reflexes.

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Reflex Arcs

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  1. Reflex Arcs • Nerve impulse pathways that are responsible for involuntary actions • Look like the pathway you drew and labeled: • Receptor to • Sensory neuron to • (optional step) Interneurons in the CNS (a reflex center) to • Motor neurons to • Effector

  2. Reflexes • Automatic subconscious responses to changes within or outside the body: • Maintain homoestasis: blood pressure, heart rate, respirations, digestion, temperature • Automatic actions: swallowing, coughing, sneezing, vomiting

  3. 2 Examples of Types of Reflexes (?) • Knee-jerk reflex (patellar tendon reflex) • Employs only 2 neurons: sensory neuron communicating directly with a motor neuron • Withdrawal reflex: • A response to painful stimuli • Sensory neuron takes impulse to interneurons in the spinal cord reflex center, where it is transmitted to motor neurons. • Other interneurons carry impulses to the brain for processing of the experience and pain.

  4. Knee-jerk Reflex (Fig. 9.16)

  5. Withdrawal Reflex (Fig. 9.17)

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