If the dehydration is not corrected immediately, it can lead to the complete absence of urine production, very fast yet very weak pulse, and substantially low blood pressure. (mypetneedsthat.com)
Some fish, such as the electric ray (Torpedo nobiliana), stun their prey with huge electrical discharges, while others sense their surroundings with a stream of weak pulses — sometimes more than 1000 a second. (newscientist.com)
Although neutron stars were predicted in the 1930s, it was not until the late 1960s that observers accidentally discovered a radio source emitting weak pulses, each lasting about 0.3 second with a remarkably constant period of approximately 1.337 seconds. (britannica.com)