1. The Lymphatic System and Lymphoid Organs and Tissues20
The Lymphatic System and Lymphoid Organs and Tissues

2. collect excess fluid from interstitial spaces.
Lymphatic vessels:
collect excess fluid from interstitial spaces.
drain blood from lymph nodes.
are part of the venous system.
are built like arteries.
Answer: a. collect excess fluid from interstitial spaces.

3. Lymphatic capillaries owe their permeability to the presence of:
an open end that siphons fluid from the interstitial fluid.
minivalves in their walls.
tight junctions between adjacent cells.
proteins in the lymph fluid.
Answer: b. minivalves in their walls.

4. Surgery always results in tissue swelling.
Why would removal of lymph vessels from the right axillary region cause edema in the right arm?
Excess blood plasma builds up in regions where there are no lymph vessels.
Surgery always results in tissue swelling.
Blood is inefficiently circulated in areas where surgery has occurred.
Both b and c are true.
Answer: a. Excess blood plasma builds up in regions where there are no lymph vessels.

5. Blood capillaries, arteries, lymphatic vessels, subclavian vein
Which of the following represents a logical sequence of structures that contribute to the return of fluid into the blood via the lymphatic system?
Blood capillaries, arteries, lymphatic vessels, subclavian vein
Arteries, lymphatic vessels, blood capillaries, subclavian vein
Arteries, blood capillaries, lymphatic vessels, subclavian vein
Subclavian vein, arteries, blood capillaries, lymphatic vessels
Answer: c. Arteries, blood capillaries, lymphatic vessels, subclavian vein

6. The pumping of the heart
Which of the following contribute(s) to the flow of lymph through lymphatic vessels?
The pumping of the heart
The milking action of skeletal muscle contraction
Pressure changes in the thorax that result from breathing
Both b and c
Answer: d. Both b and c

7. Which of the following would the body perceive as an antigen?
Bacteria
Virus
Mismatched red blood cell
All of the above
Answer: d. All of the above

8. all of the above take place.
An advantage to having reticular connective tissue present in lymph nodes would be that:
the loose organization of reticular connective tissue provides niches for macrophages and lymphocytes.
lymph filters through the nodes and is exposed to lymphocytes and macrophages.
lymphocytes cycle to various areas of the body and back to lymph nodes.
all of the above take place.
Answer: d. all of the above take place.

9. The highest density of lymph nodes can be found ________.
in the arms and legs
in the brain
at the locations where lymphatic collecting vessels converge
in the intestines
Answer: c. at the locations where lymphatic collecting vessels converge

10. Lymph tends to stall inside lymph nodes. This is due to:
small-diameter spaces within the medulla.
the large volume of lymph entering the node.
fewer efferent lymphatic vessels than afferent lymphatic vessels.
fewer afferent lymphatic vessels than efferent lymphatic vessels.
Answer: c. fewer efferent lymphatic vessels than afferent lymphatic vessels.

11. _________ can enter lymph capillaries.
Bacteria
Large proteins
Interstitial fluid
All of the above
Answer: d. All of the above

12. The ______ is the largest lymphoid organ.
lymph node
spleen
thymus
tonsil
Answer: b. spleen

13. immunity; new red blood cell formation
Red pulp of the spleen is most concerned with _______, while white pulp is most concerned with _________.
immunity; new red blood cell formation
filtering lymph; T lymphocyte formation
blood filtering; immunity
urine formation; blood filtering
Answer: c. blood filtering; immunity

14. Which of the following lymphoid tissues removes defective red blood cells from the blood?
Lymph node
Thymus
Spleen
Peyer’s patches
Answer: c. Spleen

15. The thymus is important for:
T lymphocyte maturation.
removal of foreign antigens.
B lymphocyte maturation.
secretion of hormones that promote B lymphocyte immunocompetence.
Answer: a. T lymphocyte maturation.

16. Tonsils promote memory of pathogens by:
secreting antibodies into the blood.
trapping food particles to support bacterial growth.
trapping pathogens to develop immune cells with memory.
producing B lymphocytes.
Answer: c. trapping pathogens to develop immune cells with memory.