Flashcards
Nervous Systems VII
Cards in this deck (20)
- 1Key components of a reflex arc:Sense organ
Afferent neuron
Synapse
Efferent neuron
Neuro-muscular junction
Muscle - 2Reflex Arc (6)Generator P
AP
EPSP (and IPSP)
AP
End-plate P
AP - 3MOA (7)1. Sense organ generator pt
2. Stim large enough - aff fires AP
3. Aff releases neurot at synapse
4. If neurot bind to R in post-synaptic term then EPSP.
5. AP propagated along Eff
6. epsp at end plate = endplate potential
7. Propagated along muscle generating AP - 4Knee-jerk reflex is an example of aMono-synaptic reflex
- 5What's the stimulation?Stretching of the patella tendon
- 6What does this cause?Stretching of extensor muscle
- 7How is stretch sensed?By muscle spindle
- 8What does this activate?Afferent 1a sensory nerve
- 9What does this go on to stimulate and how?1a releases excitatory neurot from collaterals which synapse onto excitatory neuromuscular junctions
- 10What do these do?Release Ach onto extensor muscle, causes it to contract
- 11Where else do collaterals secrete exc neurot?Onto inhibitory synapses
- 12What's the result?inhibitory neurot released onto excitatory neuromuscular junction
Flexo relaxes - 13What's the name of this time of inhibition and excitation?Reciprocal inhibition
- 14How does GABA work?Inhibitory neurot
+ Cl- channels
Lowers AP - 15Polysynaptic Spinal Reflex stimulus standing on tackStimulus + painR in heel
- 16MOA flexor contractionSensory afferent neuron collaterals synapse with other neurons in the spinal chord
Release exc. neurot onto flexor muscle motor neurons
Flexor motor neurons release Ach onto muscle
Flexor contracts - 17Why need reciprocal inhibition?Antagonistic pair necessitates reciprocal inhibition
- 18Reciprocal inhibitionSensory afferent also releases exc. neurot onto inhib. synapse
Release inhib neurot onto extensor motor neuron - 19BalanceAs balance needed, sensory neurons communicate w/ interneurons on opposite side of spinal chord
Activates motor neuron innervating extensor and inhibits flexor - 20What is the knee-jerk test used for?Test if LMN are working
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- User has deleted their subject information Flashcards on Nervous Systems VII, created by Deleted user on 10/05/2018.
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- Deleted user · May 2018
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- May 10, 2018
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- Created by J yadonknow · May 10, 2018
- Copied by J yadonknow · May 10, 2018
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