A: Adrenaline from the nervous system lands on receptors of cardiac myocytes (heart-muscle cells), and this causes calcium channels in the membranes of those cells to open.
答：来自神经系统的肾上腺激素“着陆”到心脏肌细胞的受体，这使得这些肌细胞的膜中的钙通道打开。
2
Robots should soon be able to perform cardiac surgery without the trauma and the potential risk of breaking open the chest and plugging the patient into a heart-bypass machine.
机器人很快就可以完成无损伤的心脏手术，不会因打开胸腔和使用心脏旁路机而造成危险。
3
Objective To compare thoracoscopic and opencardiac surgery for early non-small cell lung cancer treatment.