... natalis ) to differing salinities (100%, 75%, 50% or 25% sea water) for 24 h during their spawning period and measured some key developmental and physiological traits. We found no effect of salinity on time of first heartbeat, time of hatching, first in-egg embryonic and post-hatch heart rate, or post...

... mosquito contraction heart heartbeat hemolymph Insects have an open circulatory system for the transport of nutrients, wastes and signaling molecules ( Klowden, 2007 ; Nation, 2008 ). In addition, the insect circulatory system functions in thermoregulation, promoting ventilation through...

... also affect the hearts, where aortic pulse amplitude ( P a) and, to a lesser extent, heartbeat frequency ( f H ) fall and rise with the ambient . In this case, section of the visceral or branchial nerves has no effect. Responses are again very rapid. It is concluded that the observed fall and return...

...). Myocardial membrane potentials were measured with glass microelectrodes (3 mol l −1 KCl, 10–30 MΩ). Muscle tension was recorded using a strain gauge. lobster Panulirus japonicus myocardial membrane cooling temperature calcium spike heartbeat crustacean muscle © The Company...

...Robin L. Davis ABSTRACT Raising and lowering the oxygen content in the fluid bathing the skin of the leech modified the frequency of the heartbeat. In raised concentrations of oxygen, the period between bursts of impulses in the heart excitor motoneurones (HE cells) was reduced. Conversely...