Question

when you exercise, which of the following can provide you with a feeling of peace and happiness?
○ oxygen
○ morphine
○ endorphins
○ adrenaline

Explanation:

• Oxygen is essential for respiration but doesn't directly cause peace/happiness during exercise.
• Morphine is a drug, not naturally produced during exercise for this effect.
• Endorphins are neurotransmitters released during exercise, known to induce feelings of well - being, peace, and happiness (the "runner's high").
• Adrenaline is related to the fight - or - flight response, increasing alertness, not peace/happiness.

Answer:

endorphins (the option with "endorphins" as the text)