HW Questions: Chapter 20

Select the correct statement about lymphoid tissue. A) Lymphoid tissue is predominantly reticular connective tissue. B) T lymphocytes act by ingesting foreign substances. C) Lymphoid macrophages secrete antibodies into the blood. D) Once a lymphocyte enters the lymphoid tissue, it resides there permanently.

A) Lymphoid tissue is predominantly reticular connective tissue.

What is the function of the mini-valves in lymph capillaries? A) increase permeability B) enforce a one way flow from lymphatic system into capillary bed C) connect to blood capillaries D) reduce pressure in the lymphatic capillary

A) increase permeability

After surgical removal of the spleen (i.e., a splenectomy), some other organs take over most of its functions. Which of the following spleen functions in the adult can not be performed by bone marrow? A) immune surveillance B) erythropoiesis C) removal of aged and damaged red blood cells from the blood D) storage of platelets

C) removal of aged and damaged red blood cells from the blood

Lymphedema may be treated by all EXCEPT which of the following? A) manual compression of the affected area B) movements of the affected area C) treatments that promote growth of lymphatic vessels D) bed rest to allow enhanced blood flow and therefore healing of the affected area

D) bed rest to allow enhanced blood flow and therefore healing of the affected area

Which of the following promotes closure of the minivalves associated with lymph capillaries? A) anchoring of endothelial cells to adjacent structures by collagen fibers B) inflammation of tissues surrounding lymphatic capillaries C) increasing pressure in the interstitial space D) increasing pressure inside the lymph capillary

D) increasing pressure inside the lymph capillary

Collections of lymphoid tissues, called MALT, are strategically placed throughout the respiratory, digestive, and genitourinary systems. Which one of these is located at the end of the small intestine? appendix Peyer's patches tonsils

Peyer's patches

Which of the following is a role of lymph nodes? They filter lymph. They return lymph to circulation. They produce red blood cells. They produce lymph.

They filter lymph.

Which lymphoid organ is primarily active during the early years of life?

Thymus

Which of these lymphoid organs is part of a collection of tissues called the mucosa-associated lymphoid tissues (MALT) and removes pathogens entering the pharynx (throat)?

Tonsils

Which of the following are primary lymphoid organs? bone marrow and thymus appendix and spleen lymph nodes and tonsils spleen and thymus

bone marrow and thymus

Where in the lymph node do the T cells first encounter antigens presented by dendritic cells? medullary cords in the medulla lymphoid follicles of the outer cortex germinal centers of the cortex deep in the cortex

deep in the cortex

Within buboes, bacteria are directly attacked by ______. dendritic cells B cells macrophages None of the listed responses is correct.

macrophages

Which lymphoid organ(s) serve(s) as the site where B lymphocytes become immunocompetent B cells? thyroid gland tonsils red bone marrow thymus gland

red bone marrow

Which lymphoid organ(s) serve(s) in immune surveillance and blood cell recycling? the lymph nodes the thymus the tonsils the spleen

the spleen

There is a decrease in our ability to fight infection as we age. Which lymphoid organ may have a role in this decline? thymus spleen lymph nodes

thymus

Once collected, lymph ultimately drains into __________. the liver for detoxification lymph nodes arterial circulation venous circulation

venous circulation

Which part of the spleen is the site of immune function? splenic sinusoids red pulp splenic cords white pulp

white pulp

Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes? red pulp of the spleen germinal centers of the lymph nodes Hassall's corpuscles of the thymus white pulp of the spleen

white pulp of the spleen