Final answer:
Sam is experiencing a type of breathing called hyperpnea during his first five kilometer race.
Step-by-step explanation:
Sam is experiencing a type of breathing called hyperpnea.
Hyperpnea refers to an increased depth and rate of breathing that occurs during exercise or intense physical activity. It is characterized by forceful and deep inhalations and exhalations to meet the increased demand for oxygen and removal of carbon dioxide.
In Sam's case, running in a five kilometer race requires significant energy expenditure, and his body needs more oxygen to support the working muscles. The forceful breathing helps to deliver more oxygen to the tissues and expel carbon dioxide efficiently.
Learn more about Breathing during exercise