A 5-year-old child falls and scratches herself and within a few days has an enlarged lymph node in the area draining the abrasion. The cells in the lymph node are reacting to the foreign stimulus that entered the skin and that was transported to the lymph node by which of the following? a. immunoglobulin. b. T cells. c. dendritic cells. d. complement receptors. e. Toll-like receptors.
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Step 1: Dendritic cells are antigen-presenting cells of the immune system. Show more…
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Activity: Complete the Story Lymph Flow through the Body Complete the story of the lymph flow through the body. TERMS MAY BE USED MORE THAN ONCE! Pelvic Cervical Inguinal Jugular Right Duct Cisterna Chyli Axillary Thoracic Thoracic (Left) Duct Abdominal Mesenteric Bronchomediastinal Subclavian Lymph collected from the lower appendage must be collected into lymphatic vessels and is filtered by the _(1)_ nodes located in the groin. From here, more lymph from the abdominopelvic cavity is filtered by the _(2)_ and _(3)_ nodes before moving into vessels that will eventually reach the _(4)_. This unique structure contains fatty rich lymph collected by the digestive system and previously filtered by the _(5)_ nodes along the intestinal tract. From this centralized location below the diaphragm, lymph moves into the _(6)_ duct, which transports the fluid through the thoracic cavity and eventually drains into the _(7)_ vein. This duct also receives fluid from the _(8)_, _(9)_, and _(10)_ lymphatic vessels. This accounts for ¾ of the body's lymph flow, ultimately draining the left side of the head, neck, left upper appendage and all of the abdominopelvic and lower extremities. From the right side, lymph drains from the head and neck filtered by the _(11)_ nodes before moving into the _(12)_ lymphatic vessel; the right upper appendage lymph is filtered through the _(13)_ nodes before draining into the _(14)_ lymphatic vessel and the right side of the chest filtered by the _(15)_ nodes and draining into the _(16)_ lymphatic vessel. All three of these vessels merge with the _(17)_ duct, which drains into the right subclavian vein.
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A physician suspects the lesion and pustule pictured here are indicative of tuberculoid leprosy. If the diagnosis is correct, what microorganism would be found in a skin biopsy?
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Lymph nodes a. are sacs filled with lymph. b. return excess interstitial fluid to the bloodstream. c. filter and cleanse lymph. d. are pumps that keep lymph flowing through lymphatic vessels.
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