FREE NAFC Physiology Questions and Answers

Question 1

What is the primary function of the respiratory system during exercise?

Accepted Answer

To supply oxygen to the blood and remove carbon dioxide

Answer

To maintain blood pH balance

Answer

To transport nutrients to muscles

Answer

To regulate body temperature

Question 2

Which energy system is primarily used during a 100-meter sprint?

Accepted Answer

Phosphagen (ATP-PC) system

Answer

Oxidative phosphorylation

Answer

Aerobic system

Answer

Anaerobic glycolysis

Question 3

What is the role of lactic acid in muscle metabolism during high-intensity exercise?

Accepted Answer

To be a byproduct of anaerobic glycolysis

Answer

To stimulate muscle growth

Answer

To provide long-term energy

Answer

To act as a buffer for pH balance

Question 4

Which hormone is responsible for increasing heart rate and blood pressure during exercise?

Accepted Answer

Epinephrine (adrenaline)

Answer

Cortisol

Answer

Insulin

Answer

Glucagon

Question 5

What is the main function of the mitochondria in muscle cells?

Accepted Answer

To produce ATP through aerobic respiration

Answer

To store calcium

Answer

To synthesize proteins

Answer

To store glycogen

Question 6

How does regular aerobic exercise affect resting heart rate?

Accepted Answer

It decreases resting heart rate

Answer

It increases resting heart rate

Answer

It has no effect on resting heart rate

Answer

It fluctuates resting heart rate

Question 7

Which physiological process is primarily responsible for muscle growth following resistance training?

Accepted Answer

Protein synthesis

Answer

Glycogen storage

Answer

Protein catabolism

Answer

Lipid oxidation