Question 65

Growth hormone is secreted by the pituitary gland continuously throughout the life span.

Growth hormone is produced by the pituitary gland and plays a crucial role in growth, metabolism, and overall bodily functions throughout an individual's life.

A) Thyroxine

Thyroxine is not secreted by the pituitary gland; rather, it is produced by the thyroid gland. While it plays a vital role in regulating metabolism, its secretion is not continuous throughout life in the same manner as growth hormone.

B) Melatonin

Melatonin is primarily secreted by the pineal gland, not the pituitary gland. Its secretion is closely linked to the sleep-wake cycle and varies throughout a person's life, especially in response to light exposure, making it an incorrect choice for continuous secretion.

C) Oxytocin

Oxytocin is produced by the hypothalamus and released by the pituitary gland, but its secretion is not continuous. Instead, oxytocin is released in response to specific stimuli, such as childbirth and breastfeeding, making it inadequate for the question's criteria.

D) Cortisol

Cortisol is a hormone produced by the adrenal glands, not the pituitary gland. Although its levels can fluctuate throughout the day in response to stress and other factors, it does not have the same continuous secretion pattern as growth hormone.

E) Growth hormone

Growth hormone is secreted continuously by the pituitary gland throughout an individual's life, supporting various physiological processes, including growth and metabolism, making this option the correct answer.

Conclusion

Growth hormone is the only option that is continuously secreted by the pituitary gland throughout the life span, fulfilling the requirements of the question. In contrast, all other options are either produced by different glands or have secretion patterns that do not align with the concept of continuous secretion as specified.