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Message definition (Renin–angiotensin system ) ==Activation== {{Further|Autoregulation#Renal regulation}} [[Image:Renin-angiotensin-aldosterone system.svg|thumb|center|700px|RAAS schematic]] The system can be activated when there is a loss of [[blood volume]] or a drop in [[blood pressure]] (such as in [[hemorrhage]] or [[dehydration]]). This loss of pressure is interpreted by [[baroreceptor]]s in the [[carotid sinus]]. It can also be activated by a decrease in the filtrate [[sodium chloride]] (NaCl) concentration or a decreased filtrate flow rate that will stimulate the [[macula densa]] to signal the [[juxtaglomerular cell]]s to release renin.
活性化
RAAS概略図
この系は、血液量 の減少や血圧 の低下(出血 や脱水 など)があると活性化する。この圧力の低下は頸動脈洞 の圧受容器 によって解釈される。また、濾液塩化ナトリウム (NaCl)濃度の低下や濾液流量の低下によっても活性化され、黄斑円錐体 を刺激して次糸球体細胞 にレニンを放出するように信号を送る。