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Blood Cells > reflexes 1 > Flashcards

reflexes 1 Flashcards

1
Q

what is the basic principle of a reflex arc?

A

a sensory receptor receives sensory information from the periphery and synapses on a motor neurone in the anterior horn of the spinal cord, the motor neurone then relays this information to a muscle

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2
Q

what are the principal differences in nerve axons which contribute to speed of transmission?

A

diameter and myelination

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3
Q

what is the conduction velocity of a type Aα fibre?

A

70-120 m/s

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4
Q

what is the conduction velocity of a type Aβ fibre?

A

30-70 m/s

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5
Q

what is the conduction velocity of a type Aγ fibre?

A

15-30 m/s

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6
Q

what is the conduction velocity of type Aδ fibres?

A

12-30m/s

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7
Q

what is the conduction velocity of type B fibres?

A

3-15m/s

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8
Q

what is the conduction velocity of type C fibres?

A

0.5-2 m/s

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9
Q

what is the diameter of a type Aα fibre?

A

12-20μm

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10
Q

what is the diameter of a type Aβ fibre?

A

5-12μm

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11
Q

what is the diameter of a type Aγ fibre?

A

3-6μm

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12
Q

what is the diameter of a type Aδ fibre?

A

2-5μm

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13
Q

what is the diameter of a type B fibre?

A

1-3μm

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14
Q

what is the diameter of a type C fibre?

A

0.1-2μm

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15
Q

what is the function of Aα fibres?

A

proprioception, somatic motor neurons

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16
Q

what is the function of Aβ fibres?

A

touch and pressure

17
Q

what is the function of Aγ fibres?

A

motor to muscle spindles

18
Q

what is the function of Aδ fibres?

A

pain and temperature

19
Q

what is the function of B fibres?

A

preganglionic autonomic

20
Q

what is the function of C fibres?

A

postganglionic sympathetic, pain and possibly heat, cold and pressure

21
Q

where do IA fibres originate?

A

muscle spindles Alpha motor neurons

22
Q

where do IB fibres originate?

A

in the golgi tendon organs Aα

23
Q

where do II fibres originate?

A

in muscle spindles, touch and pressure receptors (Aβ and Aγ)

24
Q

where do III fibres originate?

A

pain and temperature receptors (Aδ)

25
Q

where do IV fibres originate?

A

pain and other receptors (C fibres)

26
Q

what does a motor unit consist of?

A

a motor neuron and the muscle fibres it innervates

27
Q

what type of motor neurone fibres form smaller motor unit?

A

small motor neurones

28
Q

what type of motor neurones form large motor units?

A

large motor neurones

29
Q

which type of motor neurones is easiest to activate?

A

small motor neurones

30
Q

what type of muscle fibres are innervated by small motor neurones?

A

slow oxidative fibres

31
Q

what type of muscle fibres are innervated by large motor neurones?

A

fast glycolytic muscle fibres

32
Q

why are larger motor neurones harder to activate?

A

smaller motor neurones have a resting membrane potential closer to the threshold

Blood Cells (37 decks)

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