【单选题】【消耗次数：1】
下列描述，正确的是
①
血液的黏滞度增大，使血流阻力增大
②
温度降低可使血液的黏滞度增大
③
红细胞比容增大时，血流阻力增大
④
小动脉及微动脉收缩，使血流阻力增大
⑤
以上都是
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相关题目
【单选题】
血液在血管内流动时，血流阻力与血管口径的关系是：
①
与血管的半径成正比
②
与血管半径的平方成正比
③
与血管半径的平方成反比
④
与血管半径的四次方成正比
⑤
与血管半径的四次方成反比
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