Morfologii͡a (Saint Petersburg, Russia)
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School children in Chukotka aged 8-12 years were examined to study the characteristics of their physical development and its association with age, sex, and ethnicity. The study demonstrated that the migrants had higher values of body length and body mass, with a step-wise pattern of their increase, higher body fat component content as compared with the aborigines. ⋯ In aborigine boys more active thorax growth was found, while aborigine girls had higher pelvic growth rate. Migrants were shown to have higher muscular and bone mass, than aborigines.
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Up to 80-90th of XX century, lymphatic system was considered as a part of vascular system, performing the functions of drainage of tissue fluid from the organs, in addition to the venous system. In the second half of XX century, detailed research of the organs of lymphatic system, and of lymph nodes in particular, lead to the understanding of a defensive role of this system, which participated in the elimination of foreign (potentially dangerous) particles--fragments of dead cells and other tissue elements. Tissue fluid containing these substances, is absorbed into lymphatic capillaries (where it gains the name of lymph), flows through the lymphatic vessels to the lymph nodes, which serve as lymph biological filters. ⋯ After passage through the lymph nodes, cleared lymph flows into the blood through lymphatic ducts and trunks, which are continuous with the large veins in the lower regions of the neck. Thus, the lymph nodes, that are the organs of immune system, which are formed by lymphoid tissue and possess special structures for the clearance of lymph (tissue fluid), are, at the same time, the organs of lymphatic system. Lymphatic capillaries and vessels provide the transport of the lymph (tissue fluid) to the lymph nodes and conduct the lymph to the blood.