土豆炒牛肉
杭州生活
简单的英语歌Cardiovascular adaptation to pregnancy: the role of
altered vascular structure
问题分析
散文300字期刊名称： Fetal & Maternal Medicine Review
年份： 2000年
期号： 第3期
摘要：The cardiovascular system undergoes remarkable adaptive changes in pregnancy. Through a complex network of interrelated pathways the physiological respon to the conceptus ensures an adequate blood supply and oxygen gradient
to meet the demands of the feto-placental unit whilst maintaining normal maternal blood pressure. This is achievable becau the increa in maternal cardiac output and blood volume which characteri normal pregnancy occur with an associated
ps抠图方法
雁荡山and profound decrea in peripheral vascular resistance. Longitudinal studies using Doppler ultrasound and echocardiography indicate that the decline in peripheral vascular resistance occurs very early and data from the pregnant baboon and pregnant women suggest that this is the stimulus which activates the renin-angiotensin aldosterone axis and the resultant ri
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