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Anatomy &Physiology. the Nervous system reflexes . Reflexes . much of what body must do every day is programmed as reflexes a rapid, predictable, & involuntary response occur over neural pathways called refex arches. 2 Types Reflexes. Autonomic reflexes: - PowerPoint PPT Presentation
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REFLEX ACTIVITYCHAPTER 13 PART 4
Anatomy &Physiology
Reflexes
much of what body must do every day is programmed as reflexesa rapid, predictable, & involuntary
responseoccur over neural pathways called
reflex arches
Reflexes
1. Inborn or Intrinsic unlearned, unpremeditated , involuntary designed to keep you in homeostasis w/out having to
think may or may not be aware of it
2. Learned or Acquired result of practice or repetition
2 Types Reflexes
1. Autonomic reflexes: regulate activity of smooth muscles, heart, glands examples: salivating when smell Thanksgiving dinner cooking pupils dilating/constricting with change in amount
light2. Somatic reflexes:
stimulate skeletal muscles examples: pull hand away from hot stove
5 Parts to a Reflex Arc
1. Receptor: site of stimulus 2. Sensory neuron
afferent impulses to the CNS3. Integration center
Monosynaptic: 1 synapse sensory motor neuron Polysynaptic: multiple synapses with interneurons
4. Motor neuron efferent impulses to effector organ
5. Effector muscle fiber or gland that responds to efferent
impulse
5 parts of Reflex Arches
Spinal Reflexes
somatic reflexes mediated by spinal cord (no involvement of brain)
mostly, remain intact even if brain not functioning as long as spinal cord is intact
most of these do send signals to brainclinically important to asses condition of the
nervous system exaggerated, distorted of absent reflexes indicate
degeneration or pathology
Spinal Reflexes
What the Nervous System Needs to Know About Skeletal Muscle so there is Coordination1. length of muscle
muscle spindles2. amount of tension on the muscle
tendon organs
Both called proprioceptors important role in spinal reflexes provide essential feedback to cerebral cortex &
cerebellumhttps://www.youtube.com/watch?v=obM1uHucAbM
Anatomy of Muscle Spindle
The Stretch Reflex
makes sure muscle stays at length set by motor cortex
important for maintaining muscle tone adjusts it reflexively sustains upright posture in large muscles of back
https://www.youtube.com/watch?v=nuzx5WJc-mE
Stretch Reflexes
Autonomic Reflexes
https://www.youtube.com/watch?v=krhTPjle7S8
Autonomic Reflexes
Pupillary Reflexes
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