The The animal preparation was the exposed, in situ heart of a pithed bullfrog. The influence of excision and treatment with saline on the pace-maker of the frog's heart. Stannius Ligature is an experimental procedure to illustrate impulse conduction in frog heart. J Physiol. temperature on the pulse rate and contraction of the heart. Izquierdo JJ. We did an experiment, we had a frog's heart and put it in 3 different solutions, namely potassium chloride, sodium chloride and calcium chloride. Temperature-pulse rate curve ofisolated frog's heart 143 1 in 2 x io7, the greater par ot f the observations being made wit ah concentration of 1 in io7. Human core temperature is monitored and regulated by sensors in …

The Influence of Temperature and of Endocardiac Pressure on the Heart, and perticularly on the Action of the Vagus and Cardiac Sympathetic Nerves. Core temperature is the internal temperature in a living organism.

[PMC free article] [] [Google Scholar]Stewart GN. A partially frozen frog will stop breathing, and its heart will stop beating. before

Optimal core temperature for the human body is around 37 degrees Celsius, or about 98.6 degrees Fahrenheit. Both endogenous and exogenous substances can affect all aspects of cardiac behavior, altering heart rate, action potential shape, and strength and sequence of contraction. We observed that the heart rate went up when it was immersed in sodium chloride anc calcium chloride, but it went down when in potassium chloride.

What caused this increase and decrease in heart rate? Heart Rate and Core Temperature.

The hear wat perfuses d with adrenaline-Ringer immediately after isolation, the adrenaline being renewe atd th e same concentration 20 min. 1930 Jan 27; 68 (4):363–374. It will appear quite dead.