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Stimulus Specific Response on Mechanical Properties of Isolated Visceral Muscle Tissues of a Reptile, Uromastix hardwickii

Stimulus Specific Response on Mechanical Properties of Isolated Visceral Muscle Tissues of a Reptile, Uromastix hardwickii

Arifa Savanur1,*, Tallat Naz1,2, Tayyaba Hamid1,3, Syed Abid Ali4, Mian Jahangir1,3 and Muhammad Abdul Azeem4

1Neuromuscular Research Unit, Department of Physiology, University of Karachi, Karachi 75270
2Department of Physiology, Sindh Medical College, Jinnah Sindh Medical University, Karachi 
3Center of Excellence in Marine Biology, University of Karachi, Karachi
4H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270
4Department of Physiology, United Medical and Dental College, Ibrahim Hyedri Korangi, Karachi

*      Corresponding author: arifa.savanur@gmail.com

Fig. 1.

Schematic illustration of the method used for the measurement of graded mechanical response, series elastic component stiffness and rate of force development. The muscle was stimulated electrically at 240 Hz and produces graded response (P1), release by 0.5 mm (P2). Δt is the time required by muscle strip to change tension from P1 to P2.

Fig. 2.

Effect of rapid release on Uromastix hardwickii smooth muscles stimulated by 240 Hz frequency. A, positive mechanical graded response of esophageal muscle strip. B, negative mechanical graded response of intestinal muscle strip. Transient events occurring at beginning of stimulation, 0.5 mm release and the end of stimulation are indicated by arrows A, B and C.

Fig. 3.

A comparison of esophageal and intestinal smooth muscle mechanics of Uromastix hardwickii: A, graded mechanical response; B, series elastic component stiffness; C, rate of force redevelopment; D, rate of length change.

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Pakistan Journal of Zoology

October

Vol. 52, Iss. 5, Pages 1631-2026

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