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心血管系生理学:心機能の調節 - 変更履歴
2026-05-07T10:04:21Z
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2016年2月16日 (火) 17:39にGeshtaltによる
2016-02-16T17:39:21Z
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2016-02-16T17:38:15Z
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<p class="p2"><span class="s1"><b>交感神経副</b></span></p><br />
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<p class="p2"><span class="s1"><b>交感神経</b></span></p><br />
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<p class="p3"><span class="s1">(ノルアドレナリン)</span></p><br />
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<p class="p3"><span class="s1">(アセチルコリン)</span></p><br />
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<p class="p2"><span class="s1"><b>心拍数(変時作用)</b></span></p><br />
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<p class="p3"><span class="s1">増加</span></p><br />
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<p class="p3"><span class="s1">減少</span></p><br />
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<p class="p2"><span class="s1"><b>収縮力(変力作用)</b></span></p><br />
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<p class="p3"><span class="s1">増加</span></p><br />
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<p class="p3"><span class="s1">増加</span></p><br />
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<p class="p3"><span class="s1">－</span></p><br />
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<p class="p2"><span class="s1"><b>房室伝導(変伝導作用)</b></span></p><br />
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<td valign="top" class="td8"><br />
<p class="p3"><span class="s1">速くなる</span></p><br />
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<p class="p3"><span class="s1">遅くなる</span></p><br />
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<p class="p2"><span class="s1"><b>興奮閾値(変閾作用)</b></span></p><br />
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<p class="p2"><span class="s1"><b>心房筋</b></span></p><br />
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<p class="p3"><span class="s1">低くなる</span></p><br />
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<p class="p3"><span class="s1">高くする</span></p><br />
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<p class="p3"><span class="s1">(興奮しやすくなる)</span></p><br />
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<p class="p3"><span class="s1">(興奮しにくくなる)</span></p><br />
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<p class="p2"><span class="s1"><b>心室筋</b></span></p><br />
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<p class="p3"><span class="s1">低くする</span></p><br />
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<p class="p3"><span class="s1">－</span></p><br />
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<p class="p3"><span class="s1">(興奮しやすくなる)</span></p><br />
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<br />
== (1) 自己調節 ==<br />
;スターリングの心臓の法則:前負荷(拡張終期容積)の増加が１回拍出量の増加を引き起こす<br />
== (2) 自律神経による調節 ==<br />
*交感神経と副交感神経の二重支配 <br />
**変時作用 <br />
**変力作用 <br />
**変伝導作用 <br />
**変閾作用 <br />
== (3) 反射による調節 ==<br />
*動脈圧受容器反射 <br />
**動脈圧上昇⇒動脈圧受容器⇒心臓抑制中枢⇒心拍数減少⇒減圧 <br />
*Bainbridge反射(拍動数の低いとき) <br />
**静脈内に生理的食塩水または輸血を行って還流血量を増加させると心拍数が増す <br />
*心房伸展反射 <br />
**心房への還流血液量増加⇒心拍数低下 ＊Bainbridge反射とは全く別物 <br />
*呼吸性不整脈 <br />
**吸気時⇒心拍数増加 呼気時⇒心拍数低下 <br />
== (4) 液性調節 ==<br />
*アドレナリン、ノルアドレナリン：副腎髄質から</div>
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