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USMLE Step 1

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Lymphatics

Recycles 10% of Interstitial Fluid

Which of the following most appropriately describes the lymphatic system?

Transport Large Lipids from Lacteals

Which of the following is most likely a function of the lymphatic system?

Unidirectional Valves

WBCs Monitor Lymph for Pathogens

Which of the following is the most appropriate description of the function of WBCs in the lymphatic system?

Lymph Nodes Filter Lymph

Which of the following is the most appropriate statement about lymph nodes?

Merge with Veins

Which of the following is the most appropriate statement about lymph ducts in lymphatic circulation?

Characteristics

Immune System Tissues

Bone Marrow

Which of the following immune system tissues is the predominant site for lymphocyte production?

B Cells and T Cells Formed

Regarding immune system tissues, which of the following processes most likely occurs in the bone marrow?

B Cells Mature

Thymus

Which of the following immune system tissues is most likely a site of T cell maturation?

T Cells Tested For Self-Response

Regarding immune system tissues, which of the following processes most likely occurs in the thymus?

T Cells Mature

Lymph Nodes

Which of the following immune system tissues is most likely a site where lymphocytes monitor lymph for pathogens?

Mature B Cells and T Cells Monitor Lymph For Pathogens

Regarding immune system tissues, which of the following processes most likely occurs in lymph nodes?

Spleen

Which of the following immune system tissues is most likely a site where lymphocytes monitor blood for pathogens?

Mature B Cells and T Cells Monitor Blood For Pathogens

Regarding immune system tissues, which of the following processes most likely occurs in the spleen?

Innate Immunity Barriers

Skin Protects Against Pathogens

Which of the following most likely refers to the largest innate immunity barrier?

Normal Flora Outcompete Pathogens

In reference to innate immunity barriers, which of the following most closely refers to the normal set of bacteria in the body?

Lysozyme in Saliva, Tears, and Mucus

Which of the following innate immunity barriers is most likely responsible for splitting open pathogen cells?

Mucous Traps Pathogens

Regarding innate immunity barriers, which of the following specifically takes place in the respiratory tract?

Cilia Remove Mucus

When mucus traps pathogens, which of the following innate immunity barriers removes the mucus from the respiratory tract?

Acid and Digestive Enzymes in the Stomach Kill Pathogens

Which of the following innate immunity barriers most likely results in dead pathogens being expelled through the excretory system?

Cell Surface Proteins - B Cells

Which of the following is a B cell surface protein that undergoes rearrangement during B cell development and can serve as a receptor for antigens?

CD19

Which of the following proteins is a co-receptor to CD21 and present on all non-plasma B cells?

CD20

Which of the following proteins is involved in optimizing immune responses, present on B cells after pro-B but lost in plasma cells?

CD21

Which of the following proteins is a co-receptor to CD19 and known as the Epstein-Barr receptor?

CD40

Which of the following is a B cell surface protein that provides the costimulatory signal for isotype class switching?

MHC II

Which of the following is a B cell surface protein that presents foreign antigens and induces antibody production?

Which of the following is a B cell surface protein that specifically facilitates T cell activation?

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