Electromyographic (EMG) activity of skeletal muscles that either insert on the skin or are associated with the margins of subcutaneous lymph sacs was monitored for two species of anurans, Chaunus marinus and Lithobates catesbeiana (formerly Bufo marinus and Rana catesbeiana). Our hypothesis was that contraction of these muscles varies the volume, and hence pressure, within these lymph sacs, and...

Rapid (8-12 Hz) stimulation of intact heart muscle treated with ryanodine results in steady contractile activation known as tetanus, the amplitude of which can be graded by changing extracellular Ca concentration ([Ca]0). The mechanism of the sustained force generation was explored in ferret papillary muscles by measuring membrane potential and by determining the responsiveness of force and int...

Adenosinetriphosphatase (ATPase) activity, isometric tension, and sarcomere length of glycerinated fibers from 14 hypertrophied and 18 normal rabbit hearts were measured simultaneously to characterize the altered performance of hypertrophied myocardium. ATPase activity was assessed radiochromatographically, and contributions from mitochondria, sarcolemma, and sarcoplasmic reticulum were exclude...

Adenosinetriphosphatase (ATPase) activity, isometric tension, and sarcomere length of glycerinated fibers from 14 hypertrophied and 18 normal rabbit hearts were measured simultaneously to characterize the altered performance of hypertrophied myocardium. ATPase activity was assessed radiochromatographically, and contributions from mitochondria, sarcolemma, and sarcoplasmic reticulum were exclude...

Abstract The morphology of the antennal hearts in head Phasmatodea and Embioptera was investigated with particular reference to phylogenetically relevant key taxa. circulatory organs all examined species have same basic construction: they consist vessels that are connected ampullae located near antenna base. pulsatile due associated muscles, but points attachment differ between studied. All a M...

The tricuspid valve is more differentiated during evolutionary development than the mitral valve. In birds it is a muscular structure joined directly to the papillary muscles, although the mitral valve of birds resembles that of mammals. There have been well-known studies describing the evolutionary line of connection of the tricuspid valve with the papillary muscles. The present study was perf...

The rate of oxygen uptake of quiescent papillary muscle of the cat heart has been determined in a flow respirometer with the use of the oxygen electrode. The apparent rate of oxygen uptake as a function of the diameter of the muscle was also determined. It was found that papillary muscles from cat hearts use oxygen at a rate of 2.84 (microliters/mg. wet weight)/hour at a temperature of 35 degre...

Nanoparticles of silver were treaeted as clinical trials in some broiler farms for its disinfecting characters in 4 broiler farms during growing period. The nanosilver were used orally and inhalatory in amount of 2 -4 ppm and 40 ppm respectively. Some samples of Breast muscle, Femora muscle, Heart, Gizzard, Liver, Skin, Spleen, Lung, Kidney and Cloacal feces were collected randomly in slaughter...