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題 名 | 離子對文蛤心臟自發性活動影響之初探 |
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作 者 | 李小惠; 傅俐芳; 林金盾; | 書刊名 | 師大生物學報 |
卷 期 | 29:1 1994.06[民83.06] |
頁 次 | 頁35-41 |
分類號 | 383 |
關鍵詞 | 文蛤; 離體心臟; 鈉離子; 鉀離子; 鈣離子; 氯離子; Meretrix lusoria; Isolated heart; Na[feb7]; K[feb7]; Ca[feb7][feb7]; Cl[fed2]; |
語 文 | 中文(Chinese) |
中文摘要 | 本實驗以文蛤Meretrix lusoria離體心臟自發性的心室收縮力和活動電位為測定項目,研究離子對心臟收縮的影響。實驗時,先將文蛤心臟分離,再用張力測定儀及吸引電極分別測定心室收縮力(CF)及活動電位振幅(AP),再以含不同無機離子(Na+,K+,Ca++,Cl-)濃度的人工海水(ASW),或特定離子通道的抑制劑,灌流離體心臟,觀察並紀錄其影響。結果得知Na+-free ASW處理10分鐘後,其CF, HR和AP均下降(P <0.05),但是,在處理的30分鐘內,心臟仍有規則性的活動。以High-K+ASW灌流時,其CF有顯著性的上升(P < 0.01),但是HR則下(P<0.01)。用4-Aminopyridine (濃度1.0×10-4M)灌流時,對CF的作用類似High-K+ASW的處理結果,但AP的振幅高度增大(P< 0.05),而HR無顯著性的變化。以Ca++-free ASW或K+free ASW處理後,在30分鐘內自發性活動並不因灌流時間的增加而變化。Cl-free ASW灌流心臟30分鐘的處理內,其CF及AP均增加(P< 0.05),HR很顯著的降低(P < 0.01)。但是心臟的活動並未停止。特殊的反應是AP的寬度增大,在30分鐘的處理內,其AP的寬度可增至6倍左右。本實驗證明文蛤心臟的子發性收縮活動受離子濃度的影響,但是有部份結果與脊椎動物的心臟反應不一致,文中將討論這種不一致的可能原因。 |
英文摘要 | The ionic basis of cardioregulatory mechanism were studied by measuring the effects of ions on the contractile force (CF), heart rate (HR) and action potential (AP) of an isolated heart of a marine bivalve, Meretrix /usoria. Both CF and AP were simultaneously recorded by a force transducer and by a suction electrode, respectively. The cardiac autorhythmicity were test by perfusion of the various concentration of ions in artificial sea water (ASW) and several types of ion channel inhibitors. Perfusion of Na+-free ASW inhibited the cardiac performances (decreased CF, HR and AP), however, the cardiac activity did not completely stop during the perfused period. Treatment with high-K+ ASW made the CF increase and the HR decrease, but had no significant effects on the AP. 4-Aminopyridine (an inhibitor of K+ channels) at 1.0 × 10-4M behaved as the effects of high-K+ ASW on the CF, but enlarged the AP and had no effect on the HR. Perfusion of Ca ++ -free ASW had no significant effects on the CF,HR or AP. Lanthanum chloride (an inhibitor of Ca ++ channels) at 1.0 X 10-4M like Ca ++ -free ASW had no effects on the CF, AP and HR. Application of Cl-free ASW enforced the CF, slowed the HR and enlarged the amplitude of cardiac action potential. Particularly, Cl-free ASW significantly elongated the duration of action potential in six folds of normal ASW. The differences of cardiac autorhythmicity in response to ions between vertebrates and invertebrates is discussed. |
本系統中英文摘要資訊取自各篇刊載內容。