All of the following developmental events are dependent on the production of maternal or fetal glucocoicoids EXCEPT
Correct Answer: Induction of thymic involution
Description: The functions attributed to fetal glucocoicoids are: Induce development and maturation of various enzyme systems in the liver Aid in maturation of pancreatic b cells Play a role in change from HbF to HbA Stimulate synthesis of surfactant by type II pneumocytes Play a role in paurition Stimulate formation of adrenal medulla and synthesis of catecholamines Thymus increases in size up to 5th year of life. Involution of thymus occurs at the time of pubey. Although it is brought about by glucocoicoids, involution of thymus is not a function of fetal/maternal glucocoicoids, as it continues to grow in size until much after bih. Before second trimester, most of the T4 in fetus is maternal. Fetal production of thyrotropin (TSH) and the T4 begin to increase in the second trimester, concurrent with development of the hypothalamic-pituitary poal system. Maternal glucocoicoids may have a role in the functional hypothalamo-pituitary axis in fetus.
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now