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.
Segments of the rattle break periodically, and longer rattles do not necessarily produce louder sounds. When the apparatus is shaken at high speed, a buzz or rattling sound is created; rattlesnakes have three sets of dedicated, tail-shaking muscles in their tail.Two of the muscle groups pull the tail to each side, and a third set of muscles allows the ventral surface to be aimed in either direction.hen the apparatus is shaken at high speed, a buzz or rattling sound is created; rattlesnakes have three sets of dedicated, tail-shaking muscles in their tail. Two of the muscle groups pull the tail to each side, and a third set of muscles allows the ventral surface to be aimed in either direction.