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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

ABSTRACT

Mechanical properties of a muscle have traditionally been described on the basis of the characteristics of parallel elastic component (PEC), series elastic component (SEC) and contractile element (CE). Reptiles in general and Uromastix in particular have been less investigated regarding the mechanical responses and the characteristics of elastic elements of their visceral muscle tissues. Therefore, a comparative study was conducted to determine the mechanical properties of esophageal and intestine tissue strips of Uromastix hardwickii. Tissues were subjected to electrical stimulation in order to observe the graded mechanical response, and the quick isotonic release method was used for the measurement of stiffness in the series elastic component. The higher stiffness in intestinal tissues as compared to esophageal tissue of Uromastix is probably associated with its lesser compliance due to a lesser quantity of SEC that makes the intestine stiffer, as its muscle cells are less embedded in a collagen matrix. A significant difference between both types of muscle strips was observed in the rate of force re-development and change in their length. Thus, the present study provokes the need for quantitative histological and histo-chemical studies on the non-contractile proteins of Uromastix smooth muscle.
 

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Pakistan Journal of Zoology

August

Vol. 52, Iss. 4, Pages 1225-1630

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