CFP Exercise Science & Physiology 2

Question 1

Which energy system is the PRIMARY source of ATP during a maximal-effort sprint lasting 6–10 seconds?

Accepted Answer

Phosphocreatine (ATP-PCr) system

Answer

The ATP-PCr system provides immediate, high-power energy for very short maximal efforts of 6–10 seconds without requiring oxygen.

Question 2

During aerobic exercise, which organelle is primarily responsible for ATP production via oxidative phosphorylation?

Accepted Answer

Mitochondria

Answer

Mitochondria contain the electron transport chain and ATP synthase, making them the site of aerobic ATP production.

Question 3

A client's heart rate fails to increase appropriately during progressively harder exercise. This condition is called:

Accepted Answer

Chronotropic incompetence

Answer

Chronotropic incompetence is the inability of the heart to increase rate appropriately in response to increased exercise demand.

Question 4

Which muscle fiber type has the HIGHEST oxidative capacity and is most resistant to fatigue?

Accepted Answer

Type I (slow-twitch)

Answer

Type I (slow-twitch) fibers have abundant mitochondria and myoglobin, giving them high oxidative capacity and excellent fatigue resistance.

Question 5

The Fick equation defines VO₂ as the product of cardiac output and which other variable?

Accepted Answer

Arteriovenous oxygen difference (a-vO₂ diff)

Answer

The Fick equation states VO₂ = Cardiac Output × (a-vO₂ difference), reflecting how much oxygen is extracted by working tissues.

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