Catch and the mechanism of action of 5-hydroxytryptamine on molluscan muscle: a speculation |
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| Authors: | B M Twarog |
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| Affiliation: | 1. College of Horticulture and Forestry, Huazhong Agricultural University, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Wuhan 430070, China;2. National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China;3. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;1. School of Liberal Arts, Korea University of Technology and Education, Cheonan 31253, Republic of Korea;2. Department of Mathematics Education, Incheon National University, Incheon 22012, Republic of Korea;3. Department of Mathematics Education, Kongju National University, Kongju 32588, Republic of Korea |
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| Abstract: | It is speculated that catch in molluscan muscle depends on sustained high levels of free intracellular calcium ion, that 5-HT (5-hydroxytryptamine, serotonin) in proportion to its concentration, increases the binding of intracellular calcium to a “relaxing” system, and that reduction of intracellular free calcium explains the apparent paradox that catch is relaxed while membrane excitability is increased.The speculations are based upon experiments detailing the relationship between 5-HT concentration and its action on catch and membrane excitability. An analogy is made between these results and the relationship between calcium concentration and action on contractility and membrane excitability in a striated muscle. |
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