Skip to main content
Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues
Hoehn - Marieb Human Anatomy & Physiology, 12th edition
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoHoehn, Haynes, Abbott 12th EditionCh. 20 The Lymphatic System and Lymphoid Organs and TissuesProblema 13
Capitolo 20, Problema 13

Which anatomical characteristic ensures that the flow of lymph through a lymph node is slow?
Why is this desirable?

Guida verificata passo dopo passo
1
Understand the structure of a lymph node, focusing on the pathways lymph takes as it enters and exits the node. Lymph enters through multiple afferent lymphatic vessels and exits through fewer efferent lymphatic vessels.
Recognize that the anatomical characteristic responsible for slowing lymph flow is the presence of fewer efferent lymphatic vessels compared to afferent vessels, creating a bottleneck effect.
Explain that this bottleneck causes lymph to move more slowly through the lymph node, allowing more time for immune cells within the node to interact with and filter the lymph.
Discuss why slow lymph flow is desirable: it enhances the immune surveillance process by giving lymphocytes and macrophages sufficient time to detect and respond to pathogens, debris, or abnormal cells present in the lymph.
Summarize that the combination of multiple afferent vessels and a single or fewer efferent vessels ensures a controlled, slow flow of lymph, optimizing the lymph node's role in immune defense.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Structure of Afferent and Efferent Lymphatic Vessels

Lymph nodes have multiple afferent lymphatic vessels bringing lymph in, but only one or few efferent vessels for lymph to exit. This anatomical arrangement creates a bottleneck effect, slowing lymph flow through the node to allow adequate filtration.
Video consigliato:
Percorso guidato
7:02
Types of Lymphatic Vessels

Lymph Node Sinuses and Their Role in Flow Regulation

Within the lymph node, lymph passes through a network of sinuses lined with macrophages and reticular fibers. These sinuses create resistance and slow the lymph flow, facilitating the trapping of pathogens and debris for immune surveillance.
Video consigliato:
Percorso guidato
10:32
Lymph Node Structure

Importance of Slow Lymph Flow for Immune Function

Slowing lymph flow allows immune cells in the lymph node sufficient time to detect and respond to foreign antigens. This enhances the efficiency of immune activation and the removal of harmful substances before lymph returns to circulation.
Video consigliato:
Percorso guidato
10:32
Lymph Node Structure
Pratica correlata
Domanda del libro di testo

Once almost a rite of childhood, tonsillectomy (surgical removal of the tonsils) is now rarely performed. Similarly, while ruptured spleens were once routinely removed, they are now conserved whenever possible. Why should these lymphoid organs be preserved when possible?

1225
views
Domanda del libro di testo

Compare the structure and functions of a lymph node to those of the spleen.

1482
views
Domanda del libro di testo

There are no lymphatic arteries. Why isn't this a problem?

1306
views
1
rank
Domanda del libro di testo

Compare and contrast blood, interstitial fluid, and lymph.

826
views
1
rank
Domanda del libro di testo

A friend tells you that she has tender, swollen 'glands' along the left side of the front of her neck. You notice that she has a bandage on her left cheek that is not fully hiding a large infected cut there. Exactly what are her swollen 'glands,' and how did they become swollen?

1007
views
Domanda del libro di testo

Mrs. Jackson, a 59-year-old woman, has undergone a left radical mastectomy (removal of the left breast and left axillary lymph nodes and vessels). Her left arm is severely swollen and painful, and she is unable to raise it to more than shoulder height.

Explain her signs and symptoms.

Can she expect to have relief from these symptoms in time? How so?

702
views