heme

例句：

1. 1. Heme is an essential component of hemoglobin, which carries oxygen in the blood.
   血红素是血红蛋白的重要组成部分，它负责携带血液中的氧气。
2. 2.The study of heme has led to new insights into the structure and function of hemoglobin.
   对血红素的研究揭示了血红蛋白的结构与功能的新见解。
3. 3.Heme was discovered by scientists who were trying to understand the mechanism of photosynthesis.
   科学家发现了血红素，他们试图理解光合作用的原理。