#Question id: 11588
#Unit 7. System Physiology – Animal
Correct and appropriate signal transduction processes are generally under strong selective pressure and are determined by the properties of the molecules involved, the concentrations of signal and receptor molecules, and the binding affinities between signal and receptor. Therefore, a hormone action is very specific in a species at any one point in time. However, there are examples of very diverse functions of a specific hormone between groups of organisms. For example, thyroxin, which is produced in all vertebrates and many invertebrates, can trigger growth, differentiation, metamorphosis, maturation, reproduction, behavior, temperature tolerance, osmoregulation, or seasonal adaptation depending on the organism in which it is produced. What is the most logical explanation for such different responses triggered by thyroxin in organisms?
#Question id: 11589
#Unit 7. System Physiology – Animal
The body's reaction to parathyroid hormone (PTH), raising plasma levels of calcium, can be opposed by:
#Question id: 11643
#Unit 7. System Physiology – Animal
Rapid changes to skin color in many vertebrates is under the control of ________.
#Question id: 11644
#Unit 7. System Physiology – Animal
Seven days after ovulation, pituitary secretion of luteinizing hormone (LH) decreases rapidly. What is the cause of this decrease in secretion?
#Question id: 11645
#Unit 7. System Physiology – Animal
Which of the following is inconsistent with the diagnosis of Graves’ disease?
#Question id: 11646
#Unit 7. System Physiology – Animal
Which of the following statements about antidiuretic hormone is true?