The neurohormones are produced in the hypothalamic region of the brain which are stored and secreted into the blood by the neurohypophysis/posterior pitutary lobe. thus,op D.

Posterior pituitary lobe: Accumulation and Release Centre of Neurohormones

Neurohormones are chemical messengers produced by neurons that act on distant target cells. They are released into the blood by specialized cells called neurosecretory cells. The posterior pituitary lobe is an accumulation and release centre of neurohormones.

Anatomy of Posterior Pituitary Lobe

The posterior pituitary lobe is a small, pea-sized structure that is part of the pituitary gland, which is located at the base of the brain. It is composed of nerve fibers and specialized cells called pituicytes.

Neurohormones Released by Posterior Pituitary Lobe

The posterior pituitary lobe releases two main neurohormones: oxytocin and vasopressin (also called antidiuretic hormone or ADH). Oxytocin is involved in social bonding, sexual reproduction, and childbirth. Vasopressin regulates water balance in the body by reducing urine output and increasing water reabsorption in the kidneys.

Control of Neurohormone Release

The release of oxytocin and vasopressin from the posterior pituitary lobe is controlled by the hypothalamus, which is a region of the brain that regulates many physiological functions including hunger, thirst, body temperature, and hormone secretion. The hypothalamus produces and releases neurohormones that stimulate or inhibit the release of oxytocin and vasopressin from the posterior pituitary lobe.

Conclusion

In summary, the posterior pituitary lobe is an accumulation and release centre of neurohormones. It releases oxytocin and vasopressin, which are involved in various physiological functions such as social bonding, sexual reproduction, childbirth, and water balance. The release of these neurohormones is controlled by the hypothalamus.