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Which of the following hormones control ...

Which of the following hormones control 24 - hour diurnal cycle or rhythmic activity of human body ?

A

Thymosin

B

Melanin

C

Melatonin

D

Thyroxine

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Which of the following hormones control 24-hour diurnal cycle or rhythmic activity of the human body?", we will analyze the given options step by step. ### Step 1: Understand the Concept of Diurnal Cycle - The diurnal cycle refers to the 24-hour cycle that includes the alternation of day and night. It is closely related to the sleep-wake cycle and other rhythmic activities in the human body. **Hint:** Think about how our bodies respond to light and darkness throughout the day. ### Step 2: Analyze the Given Hormones We have four options to consider: 1. **Thymosine** 2. **Melanin** 3. **Melatonin** 4. **Thyroxine** **Hint:** Consider the function of each hormone and which one is related to sleep and circadian rhythms. ### Step 3: Evaluate Each Hormone 1. **Thymosine**: - Secreted by the thymus gland, it plays a role in the immune system. It is not involved in regulating the diurnal cycle. **Hint:** Focus on the role of thymosine in immunity. 2. **Melanin**: - A pigment responsible for skin color. It does not have a role in regulating the diurnal cycle. **Hint:** Remember that melanin is related to pigmentation, not hormonal regulation. 3. **Melatonin**: - Secreted by the pineal gland, melatonin is known to regulate sleep-wake cycles and is directly involved in the diurnal rhythm of the human body. **Hint:** Think about how melatonin levels change with light exposure and its effect on sleep. 4. **Thyroxine**: - Produced by the thyroid gland, thyroxine regulates metabolism but does not control the diurnal cycle. **Hint:** Consider the metabolic functions of thyroxine rather than sleep regulation. ### Step 4: Conclusion Based on the analysis, the hormone that controls the 24-hour diurnal cycle or rhythmic activity of the human body is **melatonin**. ### Final Answer: **Melatonin** is the correct answer. ---
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