Simple Reflexes

Question 1

Define neural reflexes

Answer 1

Strereotyped, involuntary and rapid reactions of CNS to specific sensory input

Question 2

Describe the Neural Components/Reflex arc

Answer 2

Sensory receptors - Afferent neurones - CNS - CNS Modulation or Efferent neurones - Effector

NB: Afferent can go directly to Efferent

Question 3

What is CNS Modulation

Answer 3

Tells brain what to do in an involuntary reflex

NB: Brain can still override reflex arc

Question 4

What is the purpose of a stretch reflex

Answer 4

Adjusts degree of muscle contraction for posture

Question 5

What happens when muscle spindle stretches

Answer 5

Increase sensory = increase AP = increase motor = increase contraction

Question 6

What can interneurones do

Answer 6

Produce inhibitory/excitatory neurotransmitter

Question 7

What is the purpose of the golgi tendon organ reflex

Answer 7

Prevent damage due to overwork

Fine control of muscle tension

Question 8

What is the common factor in the knee jerk reflex and crossed extensor reflex

Answer 8

Both reflexes involve inhibitory neurotransmitters to a muscle and excitatory neurotransmitters to another muscle to coordinate movement