Can anyone tell me that why in class 3 of hypovolumic shock tachycardia

Can anyone tell me that why in class 3 of hypovolumic shock tachycardia occurs despite of decreased cardiac output

Tachycardia occurs to compensate for decreased out put due to fluid loss.

Is it like trying to compensate but still not able to… So called decompensated?

Baroreceptor mechanism gets activated resulting in increased heart rate…
So tachycardia