API
Event: 1142
Key Event Title
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Increased, valve movement
Short name
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Increased, valve movement
Biological Context
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| Level of Biological Organization |
| Tissue |
Organ term
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Key Event Components
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| Process |
Object |
Action |
| musculoskeletal movement |
valve |
increased |
Key Event Overview
AOPs Including This Key Event
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Stressors
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Taxonomic Applicability
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| Term |
Scientific Term |
Evidence |
Link |
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bivalves
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Crassostrea corteziensis
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NCBI
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Life Stages
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Sex Applicability
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Key Event Description
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In bivalves, the muscle involved in valve movement is the anterior byssus retractor muscle (ABRM). This muscle and other muscles can undergo a catch state of contraction, which is characterized by a very slowly decaying force in the absence of stimulation. When contraction of the ABRM (and other catch-capable muscles) is initiated by the neurotransmitter acetylcholine, it contracts actively and remains in the contracted state with minimal energetic investment (Güth et al. 1984; Butler et al. 1998) even after the acetylcholine stimulation has ceased and internal calcium stores are returned to basal levels(Ishii et al. 1989). This unique physiology allows the muscle to maintain a closed valve without depleting energy reserves. In mollusks, the catch state is terminated by serotonin.
How It Is Measured or Detected
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Domain of Applicability
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References
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