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Topic 7: Run for Your Life
7.1 Musculoskeletal System
7.1.3 Types of Muscle Fibers
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What are muscle fibers responsible for in skeletal muscle?
Muscle contraction
Slow twitch fibers are also known as Type
I
Slow twitch fibers have high
endurance
and slow contraction speeds.
Match the muscle fiber type with its primary characteristic:
Slow Twitch (Type I) ↔️ High myoglobin content
Fast Twitch Type IIA ↔️ Medium contraction speed
Fast Twitch Type IIB ↔️ Very fast contraction speed
Which energy production method is primarily used by Fast Twitch Type IIB fibers?
Anaerobic
Slow twitch fibers are ideal for maintaining
posture
Arrange the muscle fiber types by their contraction speed from slowest to fastest:
1️⃣ Slow Twitch (Type I)
2️⃣ Fast Twitch Type IIA
3️⃣ Fast Twitch Type IIB
Fast Twitch Type IIA
fibers use both aerobic and anaerobic energy production.
What is the primary energy source for Slow Twitch fibers?
Aerobic
Fast Twitch Type IIA fibers have medium levels of
myoglobin
What is the main use of Fast Twitch Type IIB fibers?
Sprinting
Slow Twitch fibers have low myoglobin content compared to Fast Twitch Type IIA fibers.
False
Slow Twitch fibers are highly efficient at storing and transporting
oxygen
Which type of muscle fiber is primarily used in middle-distance running?
Fast Twitch Type IIA
Arrange the main differences between muscle fiber types in terms of their importance for athletic performance:
1️⃣ Contraction speed
2️⃣ Endurance
3️⃣ Energy production methods
Slow Twitch fibers have high endurance due to their
aerobic
energy production.
Slow Twitch (
Type I
) muscle fibers primarily use aerobic energy production.
Slow Twitch (Type I) muscle fibers are ideal for endurance activities like long-distance
running
Fast Twitch Muscle Fibers are classified into Type IIA and Type
IIB
Type IIA fibers have moderate
endurance
Type IIB fibers have low endurance but very fast
contraction speed
.
What are muscle fibers responsible for?
Muscle contraction
Match the muscle fiber type with its primary use:
Slow Twitch (Type I) ↔️ Maintaining posture
Fast Twitch Type IIA ↔️ Middle-distance swimming
Fast Twitch Type IIB ↔️ Short bursts of sprinting
Slow Twitch (Type I) fibers are characterized by high endurance and aerobic
energy
Fast Twitch Type IIA fibers have moderate endurance and use both aerobic and anaerobic energy
production
Fast Twitch Type IIB fibers have low endurance and rely solely on anaerobic energy
production
The main differences between muscle fiber types lie in their contraction speed,
endurance
, and energy production methods.
Slow Twitch (Type I) fibers have a slow
contraction
Slow Twitch (Type I) fibers have a high myoglobin
content
Order the muscle fiber types from highest to lowest endurance:
1️⃣ Slow Twitch (Type I)
2️⃣ Fast Twitch Type IIA
3️⃣ Fast Twitch Type IIB
Match the activity with the primary muscle fiber type used:
Long-distance running ↔️ Slow Twitch (Type I)
Weightlifting ↔️ Fast Twitch (Type II)
Swimming ↔️ Both Slow and Fast Twitch
What are muscle fibers responsible for in skeletal muscle?
Muscle contraction
Slow Twitch (Type I) muscle fibers have high endurance and use oxygen for energy production, making them primarily aerobic.
aerobic
What type of energy production is used by Fast Twitch Type IIA muscle fibers?
Aerobic & anaerobic
Fast Twitch Type IIB muscle fibers have low
endurance
but fast contraction speed.
Match the muscle fiber type with its primary characteristic:
Slow Twitch (Type I) ↔️ High endurance
Fast Twitch Type IIA ↔️ Moderate endurance
Fast Twitch Type IIB ↔️ Low endurance
The key differences between muscle fiber types lie in contraction speed, endurance, and energy
production
What allows Slow Twitch (Type I) muscle fibers to have high endurance?
Aerobic energy production
Order the properties of Slow Twitch (Type I) muscle fibers from highest to lowest:
1️⃣ Endurance
2️⃣ Myoglobin content
3️⃣ Contraction speed
Slow Twitch (Type I) muscle fibers are ideal for short bursts of high-intensity activity.
False
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