Lymphatic System and Its Functions

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What is the primary function of the lymphatic system?

To regulate body temperature

To circulate blood throughout the body

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

To aid in digestion

What type of lymphatics are small, thin-walled, and irregularly shaped?

Lymphatic capillaries (correct)

Medium-sized lymphatics

Lymph nodes

Large lymphatics

What is the term for the fluid that enters a lymphatic vessel?

Serum

Lymph (correct)

Plasma

Blood

Which of the following tissues does NOT have lymphatics?

Cartilage Signup and view all the answers

What is the term for the rounded, circumscribed masses of cells in lymphatic tissue?

Lymphatic nodules Signup and view all the answers

What is the purpose of lymphatic anchoring filaments?

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

What is the characteristic of large lymphatics?

Similar to veins with three layers and valves Signup and view all the answers

What is the function of lymph nodes?

To filter out pathogens and activate immune responses Signup and view all the answers

Where is the thymus situated?

In the superior mediastinum Signup and view all the answers

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

It is acquired only in the thymus Signup and view all the answers

What is the outer part of the cortex composed of?

Immature T-lymphoblasts Signup and view all the answers

What is the function of Hassall's corpuscles?

Unknown function 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 is the shape of the lymph node?

Ovoid or kidney-shaped Signup and view all the answers

Where do the afferent lymphatics enter the lymph node?

At the convex surface Signup and view all the answers

What is the cortex composed of?

Epithelial reticular cells, immature T-lymphoblasts, and macrophages Signup and view all the answers

What enters or leaves the lymph node through the hilum?

Blood vessels and nerves 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 closely packed small lymphocytes. Signup and view all the answers

What is the main function of macrophages in lymphatic nodules?

To 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. Signup and view all the answers

What is the primary function of lymphatic nodules?

To produce lymphocytes, have phagocytic activity, and produce antibodies. Signup and view all the answers

What is the main difference between primary and secondary lymphoid organs?

Primary lymphoid organs are responsible for the development and maturation of lymphocytes, while secondary lymphoid organs provide a place for immunocompetent cells to react with antigens. Signup and view all the answers

What is the thymus responsible for?

The maturation of T-lymphocytes. Signup and view all the answers

What is the characteristic of the germinal center of a lymphatic nodule?

It is pale in staining due to the presence of large lymphocytes and abundant pale cytoplasm. Signup and view all the answers

What is the role of lymph nodes in the immune system?

To react with antigens and build up an immune response. Signup and view all the answers