Final answer:
The statement that morning people have earlier-set circadian rhythms than night people is true. Circadian rhythms, which are influenced by the hormone melatonin and regulated by the pineal gland, orchestrate our sleep-wake cycles and are affected by light exposure, particularly blue light.
Step-by-step explanation:
The statement Morning people have circadian rhythms that are naturally set earlier than night people is True. Individuals indeed have different circadian patterns of activity, known as their chronotype. Those who identify as morning people, often referred to as morning larks, tend to have an earlier sleep-wake cycle compared to night people, who are also known as night owls. The circadian rhythm regulates the sleep-wake cycle and other physiological processes, aligning them with the day-night cycle of the external environment. The hormone melatonin, which is released in response to darkness, is a key factor in the regulation of these rhythms.
The pineal gland, an endocrine structure in the brain, is responsible for releasing melatonin, thus playing a critical role in synchronizing our circadian rhythms with changes in light exposure. These rhythms are essential for determining the times at which we are awake and asleep, and are affected by various factors including genetics, age, and light, especially blue light exposure.