t type of terior pituitary to its target cellis in kidney tubules 52. During mam
ID: 273094 • Letter: T
Question
t type of terior pituitary to its target cellis in kidney tubules 52. During mammalian labor and delivery, the contraction of of b) A negative feedback system. c) A hormone that acts in an antagonistic way with another hormone d) A hormone that is involved in a positive feedback loop. e) None of the above transduction Immediately chonging gene expression in ts uterine muscles is enhonced by oxylodh. This is an target cells 53. Analysis of a blood sample from a fasting individual who had not eaten for twenty-four hours would be expected to reveal high levels of a) Glucagon b) Insulin c) Gastrin d) Glucose 54. What is the FIRST event to occur in the fight-or -flight reaction, limmediately following reception of a stressful stimulus a) Breakdown of stored glycogen by cell in the liver. b) Secretion of adrenocorticotropic hormone (ACTH) from the anterior pituitary c) Electrical impulses sent to the adrenal gland from the hypothalamus d) Secretion of epinephrine by cells in the adrenal medulla. e) None of the above. 55. Glucocorticoids do which of the following? a) Promote the immune response. b) Increase insulin production c) Decrease blood pressure. d) Promote the release of fatty acids. e) Increase blood glucose levels 56. Which of the following factors best explains why blood pressure increases during both long-term oands term stress responses involving the adrenal gland? a) Increased heart rate. b) Higher breathing rate c) Increased concentrations of solutes in the blood. d) Temporary blockage of blood flow through intestinal capillaries e) Partial suppression of the immune system.Explanation / Answer
51) The answer will be neuroendocrine signalling (Option c).
Reason: Neuroendocrine signalling is a type of signalling in which neurosecretory cells secrete neurohormones that travel to the target cells via blood. The osmoreceptors signal the posterior pituitary to release antidiuretic hormone (ADH) which is essential to kidney function & water balance.
52) The answer will be a hormone that is involved in a positive feedback loop (Option d).
Reason: In the positive feedback loop the output enhances the original stimulus & it continues to stimulate until a negative feedback response takes over. It tends to move the system away from its equilibrium state.
53) The answer will be glucagon (Option a).
Reason: During fasting glucose level in the bloodstream falls too low. Glucagon which acts as a counter regulatory hormone to insulin helps liver to convert stored glycogen into glucose & thus maintain homeostasis.
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