Mark the correct matching of source of hormone and its function

Options

A. oxytocin-Posterior pituitary, growth and maintenance of mammary glands
B. Melatonin-Pineal gland, regulates the normal rhythm of sleepwake cycle
C. Progesterone-Corpus luteum, stimulation of growth and activities of female secondary sex organs
D. Atrial natriuretic factor-Ventricular wall increases the blood pressure

Explanation

To solve the question regarding the correct matching of the source of hormone and its function, we will analyze each option step by step.

### Step 1: Analyze Oxytocin
- **Source**: Oxytocin is secreted by the posterior pituitary gland.
- **Function**: It is responsible for stimulating uterine contractions during childbirth (parturition) and aids in milk ejection during lactation.
- **Conclusion**: The statement that oxytocin is responsible for the growth and maintenance of mammary glands is incorrect. This function is attributed to estrogen. Therefore, this option is **incorrect**.

### Step 2: Analyze Melatonin
- **Source**: Melatonin is secreted by the pineal gland.
- **Function**: It regulates the sleep-wake cycle (diurnal rhythms) and has roles in menstrual regularity and defense capabilities.
- **Conclusion**: The function of melatonin as regulating the normal rhythm of the sleep-wake cycle is accurate. Therefore, this option is **correct**.

### Step 3: Analyze Progesterone
- **Source**: Progesterone is secreted by the corpus luteum in the ovaries.
- **Function**: It is primarily responsible for maintaining the endometrium lining during the luteal phase of the menstrual cycle, which is crucial for implantation.
- **Conclusion**: The statement that progesterone stimulates the growth and activities of female secondary sex organs is incorrect; this is the role of estrogen. Therefore, this option is **incorrect**.

### Step 4: Analyze Atrial Natriuretic Factor (ANF)
- **Source**: ANF is secreted by the atria of the heart.
- **Function**: It helps to decrease blood pressure by promoting the loss of sodium and water, thus reducing blood volume.
- **Conclusion**: The statement that ANF increases blood pressure is incorrect. ANF actually works to lower blood pressure. Therefore, this option is **incorrect**.

### Final Conclusion
The only correct matching of the source of hormone and its function is:
- **Melatonin (Source: Pineal Gland) - Regulates the normal rhythm of the sleep-wake cycle.**

### Summary of Correct Option
- **Correct Option**: Melatonin secreted by the pineal gland regulates the normal rhythm of the sleep-wake cycle.

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