Genre
- Journal Article
The effects of altered temperature in vivo on in vitro smooth muscle contractility of rainbow trout intestine were investigated. Initial analysis of the data revealed a seasonal variation in the maximal tension of intestinal smooth muscle attainable with 5-hydroxytryptamine (serotonin), carbachol, KCl, and transmural stimulation in vitro. Peaks occurred in spring and troughs in autumn. There was no seasonal cycling of the potency of the stimulants. All data regarding the efficacy of the stimulants were subsequently corrected for seasonal variation. The response of smooth muscle depends on the temperature of the water in which the fish are placed (2-degrees-C-20-degrees-C). There was a marked linear increase in efficacy and a slight increase in potency of the stimulants with increasing temperature. Changes in responsiveness of the intestinal smooth muscle occurred within 30 min of moving the fish between tanks. Smooth muscle reactivity returned to pretreatment values by 48h. Any changes in responsiveness with regards to time were unlikely to be as a consequence of water temperature, but may have been a result of handling stress.
BURKA, JF, UNIV PRINCE EDWARD ISL,ATLANTIC VET COLL,DEPT ANAT & PHYSIOL,CHARLOTTETOWN C1A 4P3,PEI,CANADA.
LELYSTAD; PLATINASTRAAT 33, 8211 AR LELYSTAD, NETHERLANDS
KUGLER PUBLICATIONS BV
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Source type: Electronic(1)
Language
- English
Subjects
- fish
- FRESH-WATER
- trout
- physiology
- SMOOTH MUSCLE
- INTESTINE
- Atlantic salmon
- MECHANISMS
- Fisheries
- SALMO-GAIRDNERI
- SEROTONIN
- ACETYLCHOLINE
- Stress
- NERVE STIMULATION
- Biochemistry & Molecular Biology
- TEMPERATURE
- HIBERNATION