FREE NAFC Physiology Questions and Answers
What is the role of lactic acid in muscle metabolism during high-intensity exercise?
Lactic acid is a byproduct of anaerobic glycolysis,
produced when glucose is broken down for energy without sufficient oxygen,
typically during high-intensity exercise.
What is the main function of the mitochondria in muscle cells?
Mitochondria are the powerhouses of the cell, producing ATP through aerobic respiration,
which is critical for sustained muscle contractions during exercise.
What is the primary function of the respiratory system during exercise?
The respiratory system supplies oxygen to the blood and removes carbon dioxide, which is essential for maintaining cellular respiration and energy production during exercise.
How does regular aerobic exercise affect resting heart rate?
Regular aerobic exercise strengthens the heart muscle,
improving its efficiency and typically resulting in a lower resting heart rate.
Which physiological process is primarily responsible for muscle growth following resistance training?
Muscle growth following resistance training is primarily due to protein synthesis,
where new proteins are produced to repair and build muscle fibers, leading to hypertrophy.
Which hormone is responsible for increasing heart rate and blood pressure during exercise?
Epinephrine, also known as adrenaline,
is released by the adrenal glands during exercise, increasing heart rate and blood pressure to prepare the body for physical activity.
Which energy system is primarily used during a 100-meter sprint?
The phosphagen system provides immediate energy through the breakdown of ATP and creatine phosphate and is primarily used during short,
high-intensity activities like a 100-meter sprint.