 Stroke volume. Stroke volume sort of makes complete sense. It's the volume of blood pumped by one ventricle in one beat. So it's a volume pumped by one ventricle in one beat. Now, look on here. There's a color-coded hint for you. And tell me, how can you calculate the stroke volume, the volume pumped by one ventricle in one beat? Well, your hint is endiastolic volume and endsystolic volume. Which one, how would you use those to calculate the stroke volume, the volume of blood pumped by one ventricle in one beat? Well, the endiastolic volume is the maximum amount of blood that the ventricles can hold. And so endiastolic volume is the big number. The endsystolic volume is what's left over after systole has occurred, endsystolic volume. And that's your stroke volume, doggies. How easy was that? That was super straightforward. I feel like there's something else that I got really excited in my brain just a second ago to tell you, right this moment, I got excited and now it's gone. Sort of makes me sad because I feel like there was something else. Yeah, yeah, yeah, yeah, yeah, yeah. Right? That was pretty straightforward, wasn't it? We can use stroke volume to talk about our next little object or our little measurement, which is cardiac output.