Muscle Fibres Flashcards

1
Q

Name the 3 different types of muscle fibres

A

Type 1 (slow oxidative)
Type 2a (fast oxidative glycolytic)
Tyoe 2b (fast glycolytic)

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2
Q

What sports would be have each muscle fibre in abundance

A

Type 1:
-marathon
-road cycling
-triathlon

Type 2a:
-games player

Type 2b:
-javelin
-100m
-high jump

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3
Q

What are some structural features (things you can see) of muscle fibres

A

-size
-colour
-mitochondria density (content)
-capillary density (content)
-glycogen store

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4
Q

What are some functional features (what they do) of muscle fibres

A

-contractile speed
-contractile force
-fatigue RESISTANCE

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5
Q

What colour are all 3 muscle fibres

A

Type 1-red (due to high blood content)
Type 2a-pink
Type 2b-white

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6
Q

What is the fatigue resistance of all 3 muscle fibres

A

Type 1-high (as they are for endurance events)
Type 2a- intermediate
Type 2b- low

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7
Q

What is a twitch

A

A single contraction

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8
Q

How do we control the strength on contraction

A

-motor unit size (larger motor unit,larger contraction)
- recruit more or less motor units (all or none law)
-increase type 2b fibres for a stronger contraction
-increase rate of stimulation
-spatial summation

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9
Q

What is wave summation

A

When a muscle fibre twitches but has less time to fully relax before the next twitch,increasing the strength of contraction

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10
Q

What is tetanus

A

When the muscle has NO time to relax so it is continuously contracting

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11
Q

What is spatial summation

A

When a motor relaxes,another motor unit will contract while it has time to recover
Once recovery has finished,the first motor unit is able to contract again
summary-allows for motor units to recover or avoid fatigue

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