why?

When a person loses body water but most of the solute remains, such as through excessive sweating during exercise, ECF volume is decreased and osmolarity is increased;

The cell in the thirst center shrink as water moves from the cell into the hypertonic ECF;

The shrinking of these cells triggers a person's awareness of thirst and increase the urge to drink....

哈哈, 因为你那个太强大了, no shrinking, no triggers, so no thirsty feeling....

所有跟帖： 

• 超级专业啊。。那岂非细胞不能传导信息。。。。 -舞女- ♀ (0 bytes) () 08/21/2012 postreply 10:36:45

• 传导信息 by neurontransmitters, 细胞s receive 信息 by neuroreceptors.... -小-可- ♀ (132 bytes) () 08/21/2012 postreply 10:52:38

• 哈哈, 最后一句是跟你开玩笑的, 你当真啦 ??? -小-可- ♀ (55 bytes) () 08/21/2012 postreply 11:03:07