Muscle Fibers and Energy Systems Check

Which type of muscle fiber is primarily used for endurance activities such as long-distance running?

• Type I

• Type IIa

• Type IIb

• Type III

What is the primary energy system used during a 100-meter sprint?

• Aerobic

• Anaerobic Glycolysis

• Phosphagen (ATP-PCr)

• Oxidative

Explain the difference between aerobic and anaerobic exercise in terms of oxygen usage.

• Aerobic exercise requires oxygen, while anaerobic exercise does not.

• Anaerobic exercise requires oxygen, while aerobic exercise does not.

• Both require oxygen equally.

• Neither requires oxygen.

Which muscle fiber type is most likely to be recruited during a high-intensity, short-duration activity like weightlifting?

• Type I

• Type IIa

• Type IIx or IIb

• Type III

How does the energy system used in a marathon differ from that used in a 400-meter sprint?

• Marathon uses the phosphagen system, while the sprint uses the aerobic system.

• Marathon uses the aerobic system, while the sprint uses the anaerobic glycolysis system.

• Both use the anaerobic glycolysis system.

• Both use the phosphagen system.

Analyze how muscle fiber recruitment changes as exercise intensity increases.

• Type I fibers are recruited first, followed by Type IIa, and then Type IIb as intensity increases.

• Type IIb fibers are recruited first, followed by Type IIa, and then Type I as intensity increases.

• All fiber types are recruited simultaneously regardless of intensity.

• Only Type I fibers are recruited regardless of intensity.

Which factor is least likely to affect sports performance?

• Muscle fiber type distribution

• Weather conditions

• Shoe color

• Energy system efficiency

Describe how the phosphagen energy system contributes to sports performance.

• It provides energy for long-duration, low-intensity activities.

• It provides immediate energy for short-duration, high-intensity activities.

• It is the primary energy source for endurance sports.

• It is not used in sports performance.

Which energy system is predominantly used during a soccer match?

• Phosphagen

• Anaerobic Glycolysis

• Aerobic

• None of the above

The red muscle fibre is also termed as (remember: what muscle fiber type requires more oxygen!)

• fast-twitch muscles

• Slow-twitch muscles

• both a & b

• none of these