Take This Quiz To Learn About Secretion & Action of Melatonin

Explanation
Melatonin is classified as a neuropeptide because it is a hormone produced by the pineal gland in the brain. Neuropeptides are small protein-like molecules that function as neurotransmitters or neuromodulators in the nervous system. Melatonin plays a crucial role in regulating the sleep-wake cycle and is involved in various physiological processes, such as circadian rhythm regulation and immune function. Therefore, it falls under the category of neuropeptides rather than nitrogen species, oxidative reactive species, or none of the above.

Explanation
Melatonin is a hormone produced by the pineal gland that helps regulate sleep and the body's internal clock, known as the circadian rhythm. It plays a crucial role in promoting healthy sleep patterns and maintaining a balanced sleep-wake cycle. Additionally, melatonin acts as an antioxidant, protecting cells from oxidative damage caused by harmful free radicals. It has been found to have immune-enhancing properties, supporting the body's defense mechanisms against infections and diseases. Therefore, "All of the above" is the correct answer as melatonin functions in sleep regulation, antioxidant protection, and immunity.

Explanation
Melatonin is a hormone that regulates sleep-wake cycles. It is primarily produced in the pineal gland, a small gland located in the brain. The pineal gland receives signals from the retina in response to changes in light and darkness, and then releases melatonin to promote sleepiness at night. This hormone helps to regulate the body's internal clock and promote healthy sleep patterns.

Explanation
Melatonin is a hormone that regulates sleep-wake cycles. It is synthesized from the amino acid L-tryptophan. L-tryptophan is converted into 5-hydroxytryptophan (5-HTP) by the enzyme tryptophan hydroxylase. 5-HTP is then further converted into serotonin, which is finally converted into melatonin by the enzyme serotonin N-acetyltransferase. Therefore, L-tryptophan is the substance from which melatonin is metabolized.

Explanation
The metabolic half-life of melatonin is 20 to 50 minutes. This means that it takes approximately 20 to 50 minutes for half of the melatonin in the body to be metabolized and eliminated.

Explanation
Melatonin is a hormone that regulates sleep and wakefulness. It is primarily secreted by the pineal gland in response to darkness. When it gets dark, the pineal gland is stimulated to release melatonin, which helps to induce sleep. On the other hand, exposure to light inhibits the secretion of melatonin, promoting wakefulness. Therefore, darkness directly affects the secretion of melatonin.

Explanation
Epinephrine stimulates the secretion of melatonin. Melatonin is a hormone that regulates sleep-wake cycles, and epinephrine, also known as adrenaline, is involved in the body's stress response. Epinephrine activates the sympathetic nervous system, which in turn stimulates the pineal gland to release melatonin. This hormone helps to regulate the body's internal clock and promote sleep.

Explanation
Melatonin supplementation can cause drowsiness as a side effect. Melatonin is a hormone that regulates sleep-wake cycles, and taking it as a supplement can cause drowsiness and make a person feel sleepy. This is why melatonin is often used as a sleep aid for individuals who have trouble falling asleep or have insomnia.

Explanation
Melatonin is a hormone that is naturally produced by the body to regulate sleep-wake cycles. It helps to control the internal body clock and promote sleep. Insomnia is a sleep disorder characterized by difficulty falling asleep or staying asleep. By taking melatonin as a treatment measure, it can help regulate the sleep-wake cycle and improve sleep quality in individuals with insomnia. Therefore, melatonin is used as a treatment measure for insomnia.

Explanation
Melatonin is a hormone that regulates the sleep-wake cycle. It is produced by the pineal gland in the brain. The production of melatonin is highest during the night and lowest during the day. This is because melatonin production is stimulated by darkness and inhibited by light. During the day, when there is more exposure to light, the production of melatonin is suppressed, leading to lower levels of the hormone. Therefore, the correct answer is "Day."