Which hormone secretion is under nervous controla)Adrenal cortexb)Ante...
The posterior pituitary is often termed the neurohypophysis because the hormones of this part of the pituitary are released directly from the axonal endings of their source neurons into the circulation.
Secretion of the posterior pituitary hormones is directly from magnacellular neurons of the paraventricular and supraoptic nuclei into the circulation. These neurons project axons into the posterior pituitary via the hypothalamo-neurohypophyseal tract and terminate on a capillary bed of the inferior hypophyseal artery. Control of release in this system is under neural control and so this represents a reflex system with neural input and hormonal output.
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Which hormone secretion is under nervous controla)Adrenal cortexb)Ante...
Posterior Pituitary
The secretion of hormones from the posterior pituitary gland is under nervous control. This gland is actually an extension of the hypothalamus and is responsible for releasing hormones such as oxytocin and vasopressin (also known as antidiuretic hormone) into the bloodstream.
Nervous Control
The hypothalamus produces these hormones and then transports them to the posterior pituitary for storage and release. The secretion of these hormones is regulated by neural signals from the hypothalamus in response to various stimuli such as stress, dehydration, and changes in blood pressure.
Role of Hormones
- Oxytocin is involved in processes such as childbirth, lactation, and social bonding.
- Vasopressin helps regulate water balance in the body by controlling the reabsorption of water in the kidneys.
Neuroendocrine Reflexes
The release of hormones from the posterior pituitary is controlled by neuroendocrine reflexes, where sensory input triggers the release of hormones in response to specific stimuli. For example, the release of oxytocin during childbirth is triggered by the stretching of the cervix and uterus.
Conclusion
In conclusion, the secretion of hormones from the posterior pituitary gland is under nervous control, with the hypothalamus playing a key role in regulating the release of hormones in response to various physiological stimuli.
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