[申覆]醫學二 第3題
ganong 22nd edition P157的敘述如下
鈉離子 channel in the outer segments of the rod and cones are open in the
dark, so current flows from the inner to the outer segment.
其他就沒有提到鈣離子了
一直到P159才在resynthesis of cyclic GMP的子標題加以詳述說
Light reduces the concentration of 鈣離子as well as that of 鈉離子in the
photoreceptors. The resulting decrease in 鈣離子concentration activates
guanyl cyclase, which generates more cGMP. It also inhibits the
light-activated phosphodiesterase. Both actions speed recovery, restoring the
鈉離子channels to their open position.
有沒有哪外高手可以解釋一下
鈣離子的進出是怎麼運作的呢?
這個連結不知道有沒有用
http://www.sciscape.org/news_detail.php?news_id=1937
感謝
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