system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come patients don't bleed to death during major surgeries?
gpt
We use a tool called cautery to seal small bleeders. For larger vessels, we either run a surgical stapler across them to cut them, or the ends get tied with silk suture after clamping. In big procedures where there is a lot of blood loss, we use something called a cell saver to recycle the blood and give it back to the patient. But for most procedures, there isn't any major bleeding to control in the first place.