End systolic volume (ESV) â The amount of blood still in the. ventricles after the contraction is complete. End diastolic volume (EDV) â The amount of blood in the. ventricles after they have filled but prior to the beginning of. the contraction.
This is the fastest form of travel for most snakes, but rattlesnakes donât engage in this style of locomotion often. Rattlesnake speeds have not been specifically measured, but they likely travel at about 2 to 3 miles per hour in very short bursts. In comparison, the fastest humans can run up to 28 miles per hour.
According to the new measurements, a snake can lunge forward about half a foot in only 70 milliseconds. Faced with such speed, a lot of prey won't stand a chanceâalthough some animals are closely matched, such as the kangaroo rat. But even if an animal can react in time, they might not be able to accelerate enough to escape. Snakes are evolved to be very fast, Clark says.