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, 因為你那個太強大了, no shrinking, no triggers, so no thirsty feeling....

所有跟帖： 

• 超級專業啊。。那豈非細胞不能傳導信息。。。。 -舞女- ♀ (0 bytes) () 08/21/2012 postreply 10:36:45

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

• 哈哈, 最後一句是跟你開玩笑的, 你當真啦 ??? -小-可- ♀ (55 bytes) () 08/21/2012 postreply 11:03:07