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Knee jerk reflex flashcards bms2
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flashcard questions for specific learning objectives of knee jerk reflex lectures bms2 university of Edinburgh
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Knee jerk reflexStudy online at https://quizlet.com/_egorz7
1. Describe the general information Sensory receptor ’ CNS ’ Effector
flow in the CNS (via sensory/afferent neurone and mo-
tor/efferent neurone)
2. What does a simple reflex arc not the brain
involve?
3. Which neurones does a simple re- contains only sensory, and motor neu-
flex arc contain? rones
4. What is a simple reflex arc? Stereotypical motor response to a stim-
ulus independent of conscious thought
5. What is the difference between af- afferent is towards brain efferent is
ferent and efferent? away from brain and sends signal to
muscles
6. What is the functional unit of the The neurone
nervous system?
7. Information flows from the den- Synapse (nerve terminal)
drites along an axon to where?
8. In real neurones, morphology is re- function
lated to what?
9. In a simple neural circuit: the 'knee Motor neurone
jerk' reflex arc, what does the sen-
sory neurone directly communicat-
ed with?
10. What is the reaction time of the 20-24ms
knee jerk reflex?
11. Patellar (knee jerk) reflex exami- Due to hyperexcitability
nation comparing normal with hy-
1/5
, Knee jerk reflex
Study online at https://quizlet.com/_egorz7
perreflexia will affect one leg more
than the other. Why?
12. Components of a monosynaptic spinal cord -> synapse -> sensory neu-
reflex arc ron -> muscle spindle -> skeletal mus-
cle -> motor neuron -> back to synapse
in spinal cord
13. What is the muscle spindle? sensory receptor
14. What does the muscle spindle Muscle length
monitor?
15. Why can the muscle spindle moni- because they lie in parallel with extra-
tor muscle length? mural fibres so the spindle is shortened
or stretched at the same time
16. What is a muscle spindle receptor stretch
responsive to?
17. What causes the muscle contrac- Muscle fibre
tion?
18. What does the alpha motorneu- Extramural fibres
rone cause to contract?
19. Which motorneurone is the slow- Gamma motorneurone
est?
20. Why does the muscle spindle lie in Allows the system to measure the
parallel with muscle fibres? length of muscle
21. How long are modified muscle fi- 10mm
bres?
22. CNS
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