One thing that physiologists have learned is that without gravity our bodies begin to lose strength, leaving astronauts with weakened bones, muscles and cardiovascular systems.

生理学家发现，失去重力后身体会失去力量，这使得宇航员骨质疏松、肌肉松弛，心血管功能也相应退化。

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The results showed that the overload training had enormous effects on cardiovascular systems of rats.

结果表明，超负荷训练对大鼠的心血管系统影响较大。

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CONCLUSION: PXE is a multisystem disorder affecting the dermatologic, ocular, and cardiovascular systems.

结论：PXE是一个累及多系统的疾病，它影响着皮肤、眼和心血管系统。

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organ systems like the cardiovascular system are made up of tissues.

器官系统如心血管系统等,由组织构成

耶鲁公开课 - 生物医学工程探索课程节选

But I mean all athletes especially endurance athletes, have very efficient cardiovascular systems, in particular the most relevant at the moment Lance Armstrong, is really just extremely efficient and his ability, his body's ability to carry and use oxygen.

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Which is why, during the trials, a group of doctors led by Robert Grossman of the Methodist Hospital, Houston, will monitor such things as the participants' bone density, respiratory function and cardiovascular systems, all of which are expected to improve when someone is no longer stuck in a wheelchair.

ECONOMIST: Bionics (I)