Question

an athlete on the track team is preparing for the last race of the meet. even though the athlete has been running all season, the athlete begins to breathe heavily and their heart starts racing. once the athlete finishes their race, their heartbeat returns to a normal rate.
why do the athlete’s breathing and heart rate increase before the event?

• the brain senses fear and tells the lungs to breathe harder and the heart to beat faster.
• the lungs grow in size and cause a fear reaction.
• the heart senses danger and sends panic signals to the brain.
• the eyes see other athletes on the field and cause a fear reaction.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: The brain (specifically the nervous system) can sense stress/fear (like before a race) and signal the respiratory and cardiovascular systems to increase breathing and heart rate to prepare the body for action (fight - or - flight response). This aligns with how the body's physiological responses are regulated.
• Option 2: Lungs do not grow in size to cause a fear reaction, and fear reactions are not triggered by lung size changes.
• Option 3: The heart does not sense danger and send panic signals to the brain; the brain (and associated nervous system) is the main regulator of such responses.
• Option 4: Seeing other athletes does not directly cause a fear - based increase in breathing and heart rate through the eyes alone; the physiological response is regulated by the nervous system's perception of the situation (stress of the race), not just visual input of other athletes.

Answer:

The option "The brain senses fear and tells the lungs to breathe harder and the heart to beat faster" (the first option, assuming it has an identifier like A. The brain senses fear and tells the lungs to breathe harder and the heart to beat faster)