Exam 21: The Lymphatic and Immune Systems

The appendix is a narrow tube which traps microorganisms from the digestive tract, and these microorganisms enter its wall and activate memory lymphocytes for long-term immunity. Another immune organ that traps microorganisms is the

A patient with lymphangitis presents with visible red lines on the skin that are tender to the touch. The best explanation for this sign is that

This organ has a superficial cortex filled with lymphocytes and an inner medulla with few lymphocytes and a sizable number of degenerating epithelial reticular cells.

Use the diagram above to answer the following questions. -Identify the letter indicating the smallest lymphatic vessel that collects lymph in the peripheral tissue.

Aggregated lymphoid nodules and the ________ contain dense concentrations of lymphoid tissue and are associated with the distal structures of the digestive tract.

Which cell type has the responsibility of presenting foreign antigens to lymphocytes?

Lymphoid organs located in the mucosal lining of the pharynx.

________ are lymphatic structures that collect fat-laden fluids from the intestinal tract.

Lymph vessels drain lymph from all the lymphoid organs, as they do from almost all organs of the body. However, afferent lymph vessels enter (empty into) only one type of lymphoid organ, the

Explain why lymph from the right upper limb is drained into vessels on the right side of the neck, whereas lymph from the right lower limb is drained into vessels on the left side of the neck.

Macrophages that destroy aged and defective blood cells are present in the ________ of the spleen.

Lacteals are the micro-valves present in lymph collecting vessels.

Vaccination mimics acquired immunity.

The lymph trunk that drains the thoracic organs is called the

Epithelial cells within the thymus secrete hormones that are important to lymphocyte development.

The thymus increases in mass through childhood and then atrophies during adulthood.

Set of lymphatic capillaries that collect fat-laden fluids from the intestinal tract.

Use the diagram above to answer the following questions. -Identify the letter indicating where most nutrient and waste exchange occurs between the tissue and blood.

Which of the following would best explain why most people are sick more often as children than as adults in their 20s through 50s?

The lymph organ that lies in the superior part of the thoracic mediastinum is the