HLSC 2400U Lecture Notes - Lecture 3: Alpha Motor Neuron, Muscle Spindle, Reciprocal Inhibition

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21 Jun 2018
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Neuro Quiz 3
1A motor unit consists of: lower motor neurons, and the specific muscle fibres it
innervates (lecture 6, slide 21)
2Hennemans’ size principle indicates: The motor neurons and recruited in order of
ascending size (small to large
3What is the purpose of alpha-gamma coactivation? Maintain muscle spindle sensitivity
when extrafusal muscle fibres contract
4During agonist muscle contraction, ‘reciprocal inhibition’ produces inhibition of the
alpha motor neurons to which of the following? Antagonist muscle
5Medial upper motor neurons are involved in: innervation of postural and girdle muscles
(lecture 6, slide 56)
6Major roles of the cerebellum are: compare actual movement to indicated movement,
and adjust movements to existing conditions
7Which is an example of a hypokinetic disorder? Huntington’s disease
8Which is NOT an output of the Basal Ganglia: cerebellum
9A ‘stretch’ or ‘deep tendon reflex’ involves excitation of the antagonist muscle and
inhibition of the agonist muscle: false (lecture 6, 49-50)
10 The proteins involved in muscle contraction include actin, myosin, troponin and
tropomyosin: true (lecture 6, slide 4)
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Document Summary

1 a motor unit consists of: lower motor neurons, and the specific muscle fibres it innervates (lecture 6, slide 21) 2 hennemans" size principle indicates: the motor neurons and recruited in order of ascending size (small to large. Maintain muscle spindle sensitivity when extrafusal muscle fibres contract. 5 medial upper motor neurons are involved in: innervation of postural and girdle muscles (lecture 6, slide 56) 6 major roles of the cerebellum are: compare actual movement to indicated movement, and adjust movements to existing conditions. 8 which is not an output of the basal ganglia: cerebellum. 9 a stretch" or deep tendon reflex" involves excitation of the antagonist muscle and inhibition of the agonist muscle: false (lecture 6, 49-50)

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