- October 25, 2010 at 8:59 pm#22686
- October 25, 2010 at 9:16 pm #329271
- October 25, 2010 at 9:26 pm #329269
- October 25, 2010 at 9:36 pm #329267
- October 25, 2010 at 10:15 pm #329255
Hi. The answer to your question is hypothalamus. Pituitary gland is called the master gland while hypothalamus is the BOSS OF THE ENDOCRINE SYSTEM. The hormone secretion is controlled by the hypothalamus. There is a link between the concerned gland and the hypothalamus. For example, let us take thyroid gland. The hypothalamus stimulates the pitutary to secrete the thyroid stimulating hormone(TSH). This TSH will stimulate the thyroid gland to secrete thyroid hormones into the blood. Once there is enough thyroxine in the blood, the thyroid will give feedback to the hypothalamus to stop the stimulation. This mechanism is called as the negative feedback. If this mechanism is uncontrolled or interruptedit can result in hyperthyroidism and hypothyroidism respectively. Hope you have understood the mechanism and who is the BOSS
- October 25, 2010 at 10:30 pm #329251
I am not sure that you can say one is more important then the other, see, in the body everything is connected and the functioning of one organ depends upon the functioning of the other. For instance the pituitary gland is completely nonoperational without the hypothalamus, the posterior (neurohypophysis) basically consists of the axons of hypothalamic neurons, therefore oxytocin and vasopressin are actually made IN THE hypothalamus and transported along the neuronal axon to the axon terminal, when the specific region of the hypothalamus is stimulated the axon terminal release the transmitter compounds directly into the blood, which then takes it to the target organs. The anterior hypothalamus is not neural but glandular epithelial tissue, but its function is also tightly coupled to the hypothalamus because the hypothalamus produces releasing and inhibiting hormones, depending on the condition of the body and the necessities for the hormone, which is released from hypothalamic neurons into the portal venous system between the hypothalamus and the anterior pituitary gland that then binds to receptor on target endocrine cells in the pituitary gland and regulates the release of hormones from the anterior pituitary gland
Hear is the list of release/Inhibiting hormones
1. Hormone: thyroid releasing hormones (TRH)
Effect: stimulates TSH release from anterior pituitary
2. Hormone: corticotropin release hormone (CRH)
Effect: stimulates ACTH release
3. Hormone: growth hormone release hormone (GHRH)
Effect: release of growth hormone
4. Hormone: Prolactin Inhibitory Factor (PIF, dopamine):
Effect: inhibits the release of prolactin
5. Hormone: Gonadotropin release hormone (GnRH)
Effect: release of FSH and LH
Many of the pathways are tightly regulated by negative feedback mechanisms ensuring that the right amount of a particular hormone is present in the body at the right time
Actually, if you think about it, you might be able to say that the hypothalamus is maybe a little bit more important since it also regulates ANS, thirst, etc. While if the pituitary gland stops functioning, the hormones can of course be replaced via tablets or injections, but if the hypothalamus is not working you can not replace it an you will have a lot of problems with regulation of the sympathetic and parasympathetic responses as well as your circadian (sleep/wake cycle) rhythm.
I GUESS IN THAT SENSE YOU CAN SAY THAT THE HYPOTHALAMUS IS MORE IMPORTANT THEN THE PITUITARY.
- October 25, 2010 at 11:12 pm #329241
Pituitary secretes several hormones, but they are not essential for mainteinance of life. Pituitary hormones are mainly involved in body growth, regulation of metabolic balance and reproductive function. You can live without pituitary. But the function of hypothalamus is not only regulation of pituitary function, it also regulates body temperature, hunger, thirst, and circadian cycles. These are fundamental for our lives.
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