Compare and contrast the hormonal events that take place during ...

[biggirl4568]

Compare and contrast the hormonal events that take place during the absorptive and fasting phases of metabolism.
 
  What will be an ideal response?

Question 2

Describe the stimuli that produce osmometric thirst and cite evidence indicating the location of osmoreceptors in the brain.
 
  What will be an ideal response?

[livaneabi]

Answer to Question 1

Answer: In the absorptive phase, the release of insulin promotes the entry of glucose into cells and into the short-term store as glycogen. As glucose is used for fuel, plasma levels decline and glucagon is secreted, which in turn enhances the conversion of glycogen to glucose. After the glycogen store is depleted, triglycerides are broken down from the long-term fat store forming glycerol, which the liver can use to create glucose.

Answer to Question 2

Answer: Cells must maintain a constant volume within the cell. Changes in solute concentration outside the cell will produce movements of water through the cell membrane. A decrease in solutes outside the cell will result in water moving into the cell, whereas an increase in solutes will draw water from the cell and lead to cell shrinkage. The latter will obtain if water is lost through evaporation or if the organism consumes a salty meal. Osmoreceptors are located in the brain; injection of hypertonic saline into the tissue just anterior to the third ventricle (AV3V) will induce drinking.