Bio 20.1 Immune System Components Quiz

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Questions and Answers

What is the primary function of the thymus in the immune system?

Production of B cells

Maturation of T cells (correct)

Filtration of lymph

Destruction of pathogens

What happens to self-reactive T cells during maturation in the thymus?

They enhance immune response

They undergo apoptosis (correct)

They migrate to the bone marrow

They are activated

How do lymph nodes contribute to the immune response?

They filter lymph fluid (correct)

They generate antibodies

They initiate blood clotting

They produce red blood cells

Which of the following best describes the thymus's interaction with lymphoid progenitor cells?

It is the site where T cells mature Signup and view all the answers

Which type of leukocytes are characterized by the presence of cytoplasmic granules?

Granulocytes Signup and view all the answers

What occurs to the thymus after puberty?

It is replaced by fatty tissue Signup and view all the answers

What essential role do dendritic cells play in lymph nodes?

They engulf pathogens and present antigens Signup and view all the answers

What is the primary function of lymphoid progenitor cells derived from hematopoietic stem cells?

To become B and T lymphocytes Signup and view all the answers

Where do all types of blood cells originate in the body?

Red bone marrow Signup and view all the answers

Which of the following best characterizes self-tolerance in T cells?

They do not attack the body's own healthy cells Signup and view all the answers

What is the structural feature of lymph nodes that aids their function?

Dense fibrous capsule Signup and view all the answers

Which leukocyte type is NOT derived from myeloid progenitor cells?

B lymphocytes Signup and view all the answers

What type of cells can hematopoietic stem cells differentiate into?

Both lymphoid and myeloid progenitor cells Signup and view all the answers

Which of the following types of leukocytes are considered agranulocytes?

Lymphocytes Signup and view all the answers

What role do lymphoid organs primarily play in the immune system?

Formation and maturation of leukocytes Signup and view all the answers

Which of the following cells is NOT directly involved in the immune response?

Erythrocytes Signup and view all the answers

Study Notes

Immune System Components

The immune system protects the body from pathogens, defective cells, and toxins.
Leukocytes are white blood cells responsible for immune responses.
Granulocytes (neutrophils, eosinophils, basophils) have visible cytoplasmic granules.
Agranulocytes (lymphocytes, monocytes) lack visible cytoplasmic granules.
Red bone marrow is a lymphoid organ located within bones that produces all blood cells, including leukocytes.
Hematopoietic stem cells differentiate into lymphoid or myeloid progenitor cells.
Lymphoid progenitor cells become lymphocytes (B cells, T cells, and NK cells).
Myeloid progenitor cells become monocytes, macrophages, neutrophils, eosinophils, basophils, mast cells, and some dendritic cells.
B cells mature in the bone marrow and then migrate to other lymphoid organs like the spleen and lymph nodes.
The thymus is a lymphoid organ located above the heart, responsible for T cell maturation.
T cells mature in the thymus, eliminating self-reactive T cells that could attack the body's own healthy cells.
Self-tolerance refers to the ability of the immune system to distinguish between self and non-self antigens.
Lymph nodes are organs of the lymphatic system that filter lymph.
Lymph nodes contain macrophages and dendritic cells that identify and destroy pathogens through phagocytosis.
Dendritic cells migrate to lymph nodes after engulfing pathogens in other tissues.

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Description

Test your knowledge on the components of the immune system, including the roles of leukocytes, granulocytes, and agranulocytes. This quiz covers the maturation of B and T cells, and the functions of lymphoid organs such as the thymus and bone marrow. Understand how the immune system protects against pathogens and maintains health.