. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BOTH ADR NOR 100 75 50 25 • TRYP. 10 -7 10 -6 10 -5 10" 10 -7 10 -6 10 -5 10 -4 MOLAR CONCENTRATION MOLAR CONCENTRATION LJ LJ or O LJ (J cr. LJ o. 100 75 50 25 .^7 / '\- ---''- .'—Tf J~£ > ^-—.' ^ * .«• *--^ 5HT o k 10 • /TRYP » I I -10 10 -9 10' 10" 10 -6 10' 5 10" MOLAR CONCENTRATION FIGURE 2. A. The effects of adrenalin, of noradrenalin, and of the same molar concentra- tions made up with equal amounts of the two amines, on the amplitude of beat of the isolated Kiisycon canaliculatitm ventricle. Each
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BOTH ADR NOR 100 75 50 25 • TRYP. 10 -7 10 -6 10 -5 10" 10 -7 10 -6 10 -5 10 -4 MOLAR CONCENTRATION MOLAR CONCENTRATION LJ LJ or O LJ (J cr. LJ o. 100 75 50 25 .^7 / '\- ---''- .'—Tf J~£ > ^-—.' ^ * .«• *--^ 5HT o k 10 • /TRYP » I I -10 10 -9 10' 10" 10 -6 10' 5 10" MOLAR CONCENTRATION FIGURE 2. A. The effects of adrenalin, of noradrenalin, and of the same molar concentra- tions made up with equal amounts of the two amines, on the amplitude of beat of the isolated Kiisycon canaliculatitm ventricle. Each curve ends at the concentration at which the ventricle stopped in systole. B. A similar comparison of the effects of tryptamine, of noradrenalin, and of both simultaneously on the Busycon canaliculatum ventricle. C. The effects of tryptamine and 5-hydroxytryptamine on the amplitude of beat of the isolated Busycon canaliculatitm ventricle. DISCUSSION The pharmacological relations of the Busycon canaliculatum ventricle resemble those of other gastropod hearts. Acetylcholine has been shown to depress the beat of the hearts of the gastropods Bncchuun iindatiiin and Cyprina islandica (Welsh, 1956), Dolabclla auricula (Ebara, 1955), Cochlitoma zebra (Divaris and Krijgs- man, 1954), Helix pomatia (Jullien and Ripplinger, 1950), and irunculus (Jullienand Morin, 1931). Among the hearts listed above, tntncnlns has been reported by Morin and Jullien (1930) to have a small group of nerve cell bodies near the location where Carlson (1905) reports a ganglion in Bnsycon. However, Divaris and Krijgsman (1954) not only found no nervous elements in the white spot at the Cochlitoma scbra ventriculo-aortic junction, but also demonstrated the existence of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Size: 1738px × 1437px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
