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Reflex Lecture Chapter 7
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Reflex Rapid, predictable, and involuntary responses to stimuli
Once a reflex begins, it always follows the same path
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Types of Reflexes Autonomic
Regulate the activity of the smooth muscles, heart and glands Examples: saliva, digestion, blood pressure, sweating
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2. Somatic Stimulate skeletal muscles
Example: reflex when you touch a hot surface
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Reflex Arc neural path of a reflex Minimum of 5 parts
1. sensory receptor (reacts to stimulus) 2. afferent neuron (neuron going to CNS) 3. integration center (CNS- spinal cord) 4. efferent neuron (neuron going away from CNS) 5. effector organ (muscle or gland stimulated)
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Steps to Patellar Reflex
Sensory receptor senses strike to patellar tendon Afferent neuron sends stimulus to CNS Integration center (spinal cord) responds to stimulus
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4. Efferent neuron sends message to muscle
5. Muscle contracts causing knee to jerk
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Flexor Withdrawal Reflex
What would be the steps for the flexor withdrawal reflex if you were to accidentally touch a hot stove?
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Pain receptors in hand sense heat
Afferent neuron sends message to CNS Integration center (CNS-spinal cord) responds Efferent neuron sends response to muscle Bicep muscle contracts and forces hand to be removed from stove
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