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16 Questions

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Lymphoid Organs of The Immune System

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Questions and Answers

Where does hematopoiesis occur initially during fetal development?

In the thymus

In the liver

In the bone marrow

In the yolk sac (correct)

What is the primary function of red bone marrow?

Production of red blood cells (correct)

Production of white blood cells

Maturation of T cells

Storage of fat

Which organ is responsible for storing fat and certain stem cells?

Spleen

Liver

Bone marrow (correct)

Thymus

Which organ is NOT classified as a primary lymphoid organ?

Spleen Signup and view all the answers

What are the two types of bone marrow mentioned in the text?

Red and yellow bone marrow Signup and view all the answers

Where does B cell maturation occur?

Bone marrow Signup and view all the answers

Where does hematopoiesis take place mostly by puberty?

Sternum Signup and view all the answers

What is the red marrow in bones composed of?

Blood-filled sinusoids and blood cell precursors Signup and view all the answers

Where do blood cell precursors mature before entering the vascular circulation?

In the sinusoidal basement membrane Signup and view all the answers

What happens when there is an exceptional demand for production of new blood cells?

The liver and spleen become sites of extramedullary hematopoiesis Signup and view all the answers

What is the function of Hematopoietic Stem Cells (HSCs)?

They can differentiate into all types of blood cells Signup and view all the answers

How are HSCs identified?

By the absence of lineage-specific markers expressed in mature cells Signup and view all the answers

What roles do Innate Lymphoid Cells (ILCs) play?

Immune defense against microbes, regulation of adaptive immunity, tissue remodeling, and repair Signup and view all the answers

What happens to the thymus after puberty?

It involutes so that it is not detectable in adults Signup and view all the answers

What is the function of the thymus gland?

Maturation of T lymphocytes Signup and view all the answers

What is the composition of red marrow in bones?

Spongelike reticular framework with a network of blood-filled sinusoids lined by endothelial cells and clusters of blood cell precursors Signup and view all the answers