10 Questions
What is the main difference in the circulation of hydrophilic and lipophilic hormones?
Hydrophilic hormones are rapidly eliminated from circulation, while lipophilic hormones circulate mainly bound to plasma proteins.
What is the function of negative feedback in hormone systems?
It prevents overactivity of hormone systems by suppressing further hormone release.
What effect does binding to plasma proteins have on the half-life of lipophilic hormones?
It prolongs the half-life by slowing down hormone clearance from plasma.
Which mechanism can lead to surges of hormones?
Positive feedback control
What does the term 'half-life' refer to in relation to hormones?
The time required for blood level of a hormone to be reduced by half
How does negative feedback control prevent over-secretion of hormones?
It suppresses further hormone release when conditions or products from the hormone indicate sufficient levels.
What role does binding to plasma proteins play in the circulation of lipophilic hormones?
It slows down hormone clearance from plasma, leading to a long half-life.
What is the main effect of positive feedback control on hormone secretion?
It leads to surges in hormone secretion by promoting additional release.
In what way do hydrophilic hormones differ from lipophilic hormones in terms of their plasma levels?
Hydrophilic hormones are not bound to plasma proteins, while lipophilic hormones mainly circulate bound to proteins.
What is the primary function of neuroendocrine reflexes in controlling hormone secretion?
They coordinate responses between the nervous and endocrine systems for hormonal regulation.
Test your knowledge on the mechanisms controlling hormone secretion, including the surge of luteinizing hormone (LH) and cyclical variations in hormone release. Explore topics such as neuroendocrine reflexes and the effects of estrogen on the anterior pituitary gland.
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