3 sentences

1. 心脏由心房和心室组成。

   xīn​zàng yóu xīn​fáng hé xīn​shì zǔ​chéng.

   The heart consists of atria and ventricles.

   Source: Dong Chinese Dictionary

2. 在心脏检查中，医生重点观察了患者左心房的血液流动。

   zài xīn​zàng jiǎn​chá zhōng, yī​shēng zhòng​diǎn guān​chá le huàn​zhě zuǒ xīn​fáng de xuè​yè liú​dòng.

   During the heart examination, the doctor focused on observing the blood flow in the patient's left atrium.

   Source: Dong Chinese Dictionary

3. 他的话悄悄地打开了她的心房。

   tā de huà qiāo​qiāo de dǎ​kāi le tā de xīn​fáng.

   His words quietly opened her heart.

   Source: Dong Chinese Dictionary