Summary
1. In isolated heart preparations of Helix pomatia perfused with Hedon Fleig solution, a minimum of 5% Helix blood was necessary for sustained rhythmical beating.
2. In the absence of the first aortic valve the heart was unable to pump fluid against negative pressure gradient, the frequency of beat was directly proportional and the amplitude of beat inversely proportional to the arterial pressure while the frequency was inversely proportional to the venous pressure.
3. When the first aortic valve was included in the preparation the heart pumped efficiently and the frequency response was reversed in each case.
- Copyright © 1973 The Company of Biologists Ltd.
Article navigation
Related articles
Cited by...
More in this TOC section
Similar articles
Other journals from The Company of Biologists
Predicting the Future: Species Survival in a Changing World
Read our new special issue exploring the significant role of experimental biology in assessing and predicting the susceptibility or resilience of species to future, human-induced environmental change.
Adam Hardy wins the 2020 Journal of Experimental Biology Outstanding Paper Prize
Congratulations to winner Adam Hardy for his work showing that goby fins are as touch sensitive as primate fingertips. Read Adam’s paper and find out more about the 12 papers nominated for the award.
Stark trade-offs and elegant solutions in arthropod visual systems
Many elegant eye specializations that evolved in response to visual challenges continue to be discovered. A new Review by Meece et al. summarises exciting solutions evolved by insects and other arthropods in response to specific visual challenges.
Head bobbing gives pigeons a sense of perspective
Pigeons might look goofy with their head-bobbing walk, but it turns out that the ungainly head manoeuvre allows the birds to judge distance.