12: Muscle plasticity

Question 1

What does a darker muscle fibre type represent?

Answer 1

More oxidative enzymes

Question 2

What does a lighter muscle fibre type represent

Answer 2

Less oxidative enzymes

Question 3

What are the 3 key differences between fibre types?

Answer 3

• Type of myosin expressed
• Oxdiative vs glycolytic energy production
• Type of SERCA pump expressed

Question 4

Describe the key features of type I: slow oxidative fibres

Answer 4

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Question 5

Describe the key features of type IIB: Glycolytic fibres

Answer 5

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Question 6

Describe type IIA: Intermediate fibres

Answer 6

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Question 7

Describe the distribution of muscle fibres

Answer 7

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Question 8

Describe the effects of strength training

Answer 8

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Question 9

Describe the effects of endurance training

Answer 9

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Question 10

Describe the physical limits to muscle performance

Answer 10

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Question 11

Describe load-velocity relationship

Answer 11

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Question 12

Describe the length-tension relationship

Answer 12

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Question 13

What is a motor unit>

Answer 13

The nervous system regulates muscle force by controlling activity in ‘motor units’

-Def: A motor neuron and all the muscle fibres it innervates

Question 14

What are the properties of motor units?

Answer 14

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Question 15

What is muscle force regulated by

Answer 15

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Question 16

Describe rate of modulation of motor units

Answer 16

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Question 17

Describe recruitment of motor units

Answer 17

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Question 18

What is the effect of the type of myosin expressed

Answer 18

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Question 19

What is the effect of oxidatie vs glycolytic energy production

Answer 19

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Question 20

What is the effect of the type of SERCA pump expressed

Answer 20

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Question 21

What are two types of active control of muscle force

Answer 21

• Rate modulation of motor units

- Recruitment of motor units