PTC Exercise Physiology and Anatomy

Question 1

Which muscle is primarily responsible for knee extension?

Accepted Answer

Quadriceps

Answer

The quadriceps femoris group, located on the anterior thigh, is the primary muscle responsible for extending the knee joint.

Question 2

What is the term for the period when the heart ventricles are contracting and pumping blood?

Accepted Answer

Systole

Answer

Systole refers to the phase of the cardiac cycle when the ventricles contract and eject blood into the arteries.

Question 3

Which energy system provides the majority of ATP during a 400-meter sprint?

Accepted Answer

Glycolytic system

Answer

The glycolytic (anaerobic glycolysis) system predominates during moderate-to-high intensity activities lasting 30 seconds to 2 minutes, such as a 400-meter sprint.

Question 4

What is VO2 max?

Accepted Answer

Maximum volume of oxygen the body can use per minute

Answer

VO2 max is the maximum rate at which an individual can consume oxygen during intense exercise, expressed in mL/kg/min, and is the gold standard measure of aerobic capacity.

Question 5

Which type of muscle fiber is best suited for endurance activities?

Accepted Answer

Type I slow-twitch

Answer

Type I (slow-twitch) muscle fibers have high mitochondrial density and aerobic capacity, making them highly resistant to fatigue and ideal for sustained endurance activities.

PTC - Personal Trainer Certificate Practice Test

PTC - Personal Trainer Certificate Practice Test

PTC Exercise Physiology and Anatomy