Fitness Lessons Exercise Physiology Basics

Question 1

What is the primary energy system used during short bursts of high-intensity exercise lasting under 10 seconds?

Accepted Answer

Phosphocreatine (ATP-PC) system

Answer

The phosphocreatine (ATP-PC) system provides immediate energy for activities lasting fewer than 10 seconds.

Question 2

Which term describes the increase in muscle size resulting from resistance training?

Accepted Answer

Hypertrophy

Answer

Hypertrophy is the enlargement of muscle fibers caused by progressive resistance training.

Question 3

What does VO2 max measure?

Accepted Answer

Maximum oxygen uptake during exercise

Answer

VO2 max is the maximum rate at which the body can consume oxygen during intense exercise.

Question 4

Which muscle fiber type is most resistant to fatigue?

Accepted Answer

Type I (slow-twitch)

Answer

Type I slow-twitch fibers are highly oxidative and fatigue-resistant, making them ideal for endurance activities.

Question 5

What happens to heart rate during aerobic exercise?

Accepted Answer

It increases to deliver more oxygenated blood to muscles

Answer

Heart rate rises during aerobic exercise to pump more oxygenated blood to working muscles.

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