Muscle lateral line

Distribution. Generally the highest concentration of PCB residues in fish are in tissues of high lipid content. In Table V juvenile coho salmon were fed equal amounts of three chlorobi-phenyls for 117 days. Fish were then killed and lipid content and PCB concentration of various tissues determined (33). Tissues are arranged from top to bottom in order of increasing PCB concentration. For most tissues, but not all, as lipid content increases so does PCB concentration. Lipid content and PCB concentration are low in liver and white muscle, intermediate in spinal column and lateral line muscle, and high in adipose tissue. Lipid content cannot be the sole determinant of PCB concentration in fish tissues because a discrepancy exists between lipid content of brain, heart and spleen and PCB concentration. 

FIG. 14.2 Tracing of a transverse section of the parasitic nematode Ascaris showing the relationship between nerve and muscle. The hypodermis (gray) surrounding the pseudocoelom is raised into four longitudinal bands the larger lateral lines (LL) which also include the excretory duct, and the two major nerve cords, dorsal (DC) and ventral (VC). Muscle cells (M) are indicated in the right ventral quadrant, but have been omitted from the left ventral and both dorsal quadrants. The pharynx has also been omitted. The two filled muscle cells (black) send arms (MA) to the nerve cords, one to the ventral cord and the other to one of the four minor nerve cords. This section was taken a few millimeters behind the tip of the head. Further posteriorly, the number of muscle cells increases dramatically and the density of the muscle arms at the nerve cord increases. 

Three years later Robert F Furchgott discov ered that the relaxing of smooth muscles such as blood vessel walls was stimulated by an unknown substance produced in the lining of the blood vessels (the endothelium) He called this substance the endothelium-dependent relaxing factor or EDRF and in 1986 showed that EDRF was NO Louis J Ignarro reached the same conclusion at about the same time Further support was provided by Salvador Moncada who showed that endothelial cells did in deed produce NO and that the l arginine to l citrulline conversion was responsible... 

The superstructure of smooth muscle actin filaments is differentiated from those of striated muscle by the absence of the troponins and the lateral organization by association of the filaments with dense bodies instead of with the Z-line. How these differences are encoded is again not at all clear. However, the myofibrillar structure and the alignment of the alternating actin and myosin filaments is apparently due primarily to dense bodies and the actin-actinin macrostructures. As the bent dumbbell shaped actins assemble into filaments they are all oriented in the same direction. The S-1 fragments of myosin will bind to actin filaments in vitro and in... 

Pelts For round full lateral delts using my opposite hand, I followed my collar bone to the end with my finger. About one inch beyond and still in line with the collar, I put a mark on each lateral head. I inserted the needle 1-1.5 inches from the top as if it had fallen from above. The site was slightly behind the mid- muscle and pushed the whole area outward. 

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