Question 1

Lymph capillary permeability is due to minivalves and protein filaments.

Accepted Answer

Lymph capillaries have mini-valves and overlapping protein filaments that allow for fluid and small particles to move into the lymphatic system.

Question 2

Lymphocytes reside temporarily in lymphoid tissue, then move to other parts of the body.

Accepted Answer

Lymphocytes, a type of white blood cell, are produced in the bone marrow and can migrate to various parts of the lymphoid tissue, where they may reside temporarily. However, they can also enter the bloodstream and move to other parts of the body in order to fight infections or target specific tissues.

Question 3

If even a small part of the spleen is left in a ten-year-old child, it will most likely regenerate itself.

Accepted Answer

The spleen has the ability to regenerate itself even if only a small portion is left behind. This ability is more pronounced in children and decreases with age. Therefore, it is possible for a ten-year-old child to regenerate their spleen even if only a small part of it remains.

Question 4

The most important role of the spleen is to provide a site for lymphocyte proliferation and immune surveillance and response.

Accepted Answer

The answer of The most important role of the spleen...

Question 5

Chyle is delivered to the blood via the lymphatic system.

Accepted Answer

Chyle is delivered to the bloodstream via the lymphatic system.

Question 6

The thymus is the only lymphoid organ that does not DIRECTLY fight antigens.

Accepted Answer

The thymus is responsible for the development and maturation of T cells, which directly fight antigens. However, the thymus itself does not directly fight antigens.

Question 7

About 3 liters of fluid are lost to the tissue spaces every 24 hours and are returned to the bloodstream as lymph.

Accepted Answer

This statement is true. It is a normal process in the body known as lymphatic circulation.

Question 8

Small secondary lymphoid organs, which cluster along lymphatic vessels, are termed ___________.

Accepted Answer

Lymph nodes are small, secondary lymphoid organs that are distributed along the course of lymphatic vessels. They act as filters for foreign particles and cancer cells, and are a site of immune cell activation.

Question 9

Digested fats are absorbed from the intestine by the lymph capillaries.

Accepted Answer

Digested fats are too large to be absorbed directly into the bloodstream, so they are taken up by the lymphatic system and transported via lymph vessels to the bloodstream near the heart.

Question 10

Lymphatic capillaries are permeable to proteins.

Accepted Answer

Lymphatic capillaries are permeable to proteins, which allows them to collect and transport excess interstitial fluid and large molecules such as proteins, lipids, and immune cells back into the bloodstream.

Question 11

Peyer's patches are clusters of lymphoid tissue found primarily in the large intestine.

Accepted Answer

Peyer's patches are primarily found in the small intestine, particularly in the ileum, not in the large intestine. They are important for the immune response in the gastrointestinal tract.

Question 12

The cisterna chyli collects lymph from the lumbar trunks draining the upper limbs and from the intestinal trunk draining the digestive organs.

Accepted Answer

The cisterna chyli collects lymph from the intestinal trunk draining the digestive organs and the lumbar trunks draining the lower limbs.

Question 13

Like blood, lymph flows both to and from the heart.

Accepted Answer

Lymph only flows towards the heart, unlike blood which flows both towards and away from the heart.

Question 14

The lymphatic capillaries function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream.

Accepted Answer

This is the main function of lymphatic capillaries. They also help to carry immune cells and drain lymph nodes.

Question 15

In the spleen, red pulp is involved in the immune functions and white pulp is involved in disposing of worn-out RBCs.

Accepted Answer

In the spleen, white pulp is involved in immune functions, while red pulp is involved in filtering blood and disposing of worn-out red blood cells (RBCs).

Question 16

Lymphoid tissue is mainly reticular connective tissue.

Accepted Answer

Lymphoid tissue is primarily composed of reticular connective tissue, which is characterized by a network of reticular fibers produced by reticular cells.

Question 17

When tissues are inflamed, lymphatic capillaries permit uptake of large particles such as cell debris, pathogens, and cancer cells.

Accepted Answer

When tissues are inflamed, lymphatic capillaries become more permeable, allowing for the uptake of large particles such as cell debris, pathogens, and cancer cells.

Question 18

There are more efferent lymphatic vessels leaving a lymph node than there are afferent vessels entering a lymph node.

Accepted Answer

Lymph nodes have more afferent lymphatic vessels entering them to bring lymph into the node for filtration, and fewer efferent lymphatic vessels leaving the node, ensuring thorough exposure of the lymph to the node's immune mechanisms.

Question 19

The most important of the secondary lymphoid organs in the body are the lymph nodes.

Accepted Answer

The lymph nodes are considered the most important of the secondary lymphoid organs as they are responsible for filtering lymphatic fluid and facilitating immune responses. Other secondary lymphoid organs include the spleen, tonsils, and Peyer's patches in the intestine.

Question 20

Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics.

Accepted Answer

Lymph vessels do not have their own pumping mechanism like the heart in blood vessels. Therefore, movements of adjacent tissues, such as muscles contraction and relaxation during exercise, facilitate the flow of lymph through the lymphatics.

Quiz 20: The Lymphatic System and Lymphoid Organs and Tissues