Lymphatic System Quiz

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Questions and Answers

What is the main function of the lymphatic system in the body?

To filter waste from the blood

To circulate oxygen throughout the body

To produce immune cells

To remove tissue fluid from interstitial spaces and return it to the blood (correct)

What is the term given to the tissue fluid once it has entered a lymphatic vessel?

Serum

Lymph (correct)

Plasma

Blood

Which of the following tissues or organs do not have lymphatics?

Liver

Skin

Muscle

Cartilage (correct)

What is the characteristic of lymphatic capillaries?

They are small, thin-walled, and irregularly shaped Signup and view all the answers

What is the function of lymphatic anchoring filaments?

To anchor the lymphatic vessel to surrounding tissue Signup and view all the answers

What is the term given to a rounded mass of packed small B-lymphocytes?

Primary nodule Signup and view all the answers

What is the characteristic of the peripheral zone of a lymphatic nodule?

It is dark due to the intense staining of the nuclei of small lymphocytes Signup and view all the answers

What is the function of macrophages in lymphatic nodules?

They have phagocytic activity Signup and view all the answers

Where are lymphatic nodules typically found?

In the lamina propria of the digestive and respiratory passages, the white pulp of the spleen, and in the lymph nodes Signup and view all the answers

What is the function of lymphatic nodules in terms of antibody production?

They produce antibodies due to the presence of plasma cells Signup and view all the answers

What is the primary function of primary lymphoid organs?

To develop and mature lymphocytes into mature, immunocompetent cells Signup and view all the answers

What is the normal fate of the thymus during puberty?

It undergoes involution Signup and view all the answers

Where is the thymus situated in the body?

In the superior mediastinum Signup and view all the answers

What is unique about the thymus in terms of T-cell specificity?

T-cell specificity is acquired only in the thymus Signup and view all the answers

What is the function of the desmosomes in the thymic epithelial cells?

To connect the cells to form a desmosome Signup and view all the answers

What is the main difference between the cortex and medulla in the thymus?

The medulla has a larger number of thymic epithelial cells Signup and view all the answers

What is the function of the Hassall's corpuscles in the thymus?

They are of unknown function Signup and view all the answers

What is the shape of a lymph node?

Ovoid or kidney-shaped Signup and view all the answers

Where do the efferent lymphatics leave the lymph node?

At the hilum Signup and view all the answers

What enters the lymph node at the convex surface?

The afferent lymphatics Signup and view all the answers

Study Notes

Lymphatic System

Formed from lymph vessels and lymphatic tissue
Assists the cardiovascular system in removing tissue fluid from interstitial spaces and returning it to the blood
Lymph is the name given to tissue fluid once it enters a lymphatic vessel

Lymphatic Vessels

Lymphatic capillaries: small, thin-walled, irregularly shaped endothelial tubes surrounded by delicate connective tissue with lymphatic anchoring filaments
Small and medium-sized lymphatics: have an endothelial lining and a layer of connective tissue
Large lymphatics: similar to veins, with three layers and valves to prevent backflow

Lymphatic Nodules

Rounded, circumscribed masses of cells
Primary nodule: packed small B lymphocytes
Secondary nodule: formed of a central pale germinal center and a peripheral dark zone
Sites: lamina propria of digestive and respiratory passages, white pulp of the spleen, and lymph nodes
Functions: produce lymphocytes, have phagocytic activity, and produce antibodies

Lymphatic Organs

Primary lymphoid organs: bone marrow and thymus, responsible for development and maturation of lymphocytes
Secondary lymphoid organs: provide sites for immunocompetent cells to react with antigens and build up immunological response
Secondary lymphoid organs include: lymph nodes, spleen, tonsils, and mucosa-associated lymphoid tissues

Thymus

Primary lymphoid organ responsible for maturation of T-lymphocytes
Site: superior mediastinum
T-cell specificity is acquired only in the thymus
Structure: 2 lobes, with each lobule divided into dark peripheral cortex and pale central medulla
Cortex: contains epithelial reticular cells, immature T-lymphoblasts, mature T-lymphocytes, and macrophages
Medulla: contains thymic epithelial cells, Hassall's corpuscles, and mature T-lymphocytes

Lymph Node

Ovoid or kidney-shaped body
Convex surface: afferent lymphatics enter
Hilum: efferent lymphatics leave, and blood vessels and nerves enter or leave

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Description

This quiz covers the structure and function of the lymphatic system, including its relationship with the cardiovascular system and the role of lymphatic vessels and tissue.