3 sentences

1. 你的心脏有四个瓣膜，可以保持血液流向正确的方向。

   nǐ de xīn​zàng yǒu sì ge bàn​mó, kě​yǐ bǎo​chí xuè​yè liú​xiàng zhèng​què de fāng​xiàng.

   Your heart has 4 valves that keep blood flowing in the right direction.

   Source: CCMatrix

2. 身体的每一个器官都依赖于血液流动，尤其是心脏和大脑。

   shēn​tǐ de měi yī​ge qì​guān dōu yī​lài yú xuè​yè liú​dòng, yóu​qí​shì xīn​zàng hé dà​nǎo.

   All organs in our body depend on blood flow, especially the heart and the brain.

   Source: CCMatrix

3. 当我们长时间坐着时，我们的新陈代谢，血液流动和肌肉活动都会减少。

   dāng wǒ​men cháng​shí​jiān zuò zhe shí, wǒ​men de xīn​chén​dài​xiè, xuè​yè liú​dòng hé jī​ròu huó​dòng dōu huì jiǎn​shǎo.

   When we sit for a long period, our metabolism, blood flow and muscle activity all decrease.

   Source: CCMatrix