File Name: lymphatic system and immunity .zip
The immune system is composed of a variety of different cell types and proteins. The immune system is a wonderful collaboration between cells and proteins that work together to provide defense against infection. These cells and proteins do not form a single organ like the heart or liver. Instead, the immune system is dispersed throughout the body to provide rapid responses to infection Figure 1. Cells travel through the bloodstream or in specialized vessels called lymphatics.
Last reviewed: June A system of vessels in the vertebrate body, beginning in a network of exceedingly thin-walled capillaries in almost all the organs and tissues, except the brain and bones. The lymphatic system is a one-way vascular network in vertebrates that works in parallel with the blood circulation Fig. It drains interstitial fluid from most of the body's organs, with the exceptions of bone marrow, the retina, the central nervous system, and some avascular tissues the cornea, cartilage, hair, nails, and epidermis. The interstitial fluid, which is rich in protein, must be removed, or swelling edema will occur.
The immune system is the complex collection of cells and organs that destroys or neutralizes pathogens that would otherwise cause disease or death. The lymphatic system, for most people, is associated with the immune system to such a degree that the two systems are virtually indistinguishable. The lymphatic system is the system of vessels, cells, and organs that carries excess fluids to the bloodstream and filters pathogens from the blood. The swelling of lymph nodes during an infection and the transport of lymphocytes via the lymphatic vessels are but two examples of the many connections between these critical organ systems. A major function of the lymphatic system is to drain body fluids and return them to the bloodstream. Blood pressure causes leakage of fluid from the capillaries, resulting in the accumulation of fluid in the interstitial space—that is, spaces between individual cells in the tissues.
The immune system includes primary lymphoid organs, secondary lymphatic tissues and various cells in the innate and adaptive immune systems. The key primary lymphoid organs of the immune system include the thymus and bone marrow, as well as secondary lymphatic tissues including spleen, tonsils, lymph vessels, lymph nodes, adenoids, skin, and liver. The thymus is largest and most active during the neonatal and pre-adolescent periods of development. By the early teens, the thymus begins to atrophy and thymic stroma is replaced by adipose tissue. Nevertheless, residual T-lymphopoiesis continues throughout adult life. Bone marrow is the flexible tissue found in the interior of bones.
Энсей Танкадо - это Северная Дакота… Сьюзан попыталась расставить все фрагменты имеющейся у нее информации по своим местам. Если Танкадо - Северная Дакота, выходит, он посылал электронную почту самому себе… а это значит, что никакой Северной Дакоты не существует. Партнер Танкадо - призрак. Северная Дакота - призрак, сказала она. Сплошная мистификация. Блестящий замысел. Выходит, Стратмор был зрителем теннисного матча, следящим за мячом лишь на одной половине корта.
Сьюзан взглянула ему в. - Вы хотите отправить его домой. - Нет.
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