BIO 169 Exam 2 (Answered) 72 Questions and
Correct Answers With Complete Solution, 100%
Correct. 2024/2025.
The primary function of the lymphatic system is
a. the transport of hormones.
b. circulation of nutrients and dissolved gases.
c. defending the body against both external and internal threats.
d. the production and distribution of plasma proteins.
e. the production and maturation of leukocytes.
defending the body against both external and internal threats
The lymphatic system is composed of all of the following except
a. lymphatic vessels.
b. the venae cavae.
c. the spleen.
d. lymph nodes.
e. lymph.
the venae cavae
Compared to blood capillaries, lymph capillaries exhibit all of the following except that they
a. have no basement membrane.
b. have only a tunica interna.
c. have walls of endothelial cells that overlap like shingles.
d. are smaller in diameter.
e. are frequently irregular in shape.
are smaller in diameter
Lymph nodes do all of the following except
a. produce antibodies through B cells.
b. monitor the contents of lymph.
c. remove debris and pathogens from the lymph.
d. accumulate cancer cells.
e. remove excess nutrients from the lymph.
remove excess nutrients from the lymph
,All of the following are true of the thymus gland except that it
a. activates B cells.
b. reaches its greatest relative size during the second year of life.
c. involutes after puberty.
d. produces T cells.
e. lies in the anterior mediastinum.
activates B cells
Lymphatic organs differ from lymphatic tissues in what way?
a. They contain T lymphocytes and lymphatic tissues do not.
b. They are found in the digestive tract and lymphatic tissues are found in the thorax.
c. They are surrounded by a fibrous capsule and lymphatic tissues are not.
d. They cannot produce antibodies, whereas lymphatic tissues can.
e. They occur throughout the body except in the head.
They are surrounded by a fibrous capsule and lymphatic tissues are not
Areas of the spleen that contain large aggregations of lymphocytes are known as
a. Peyer's patches.
b. adenoids.
c. white pulp.
d. red pulp.
e. lymph nodes.
white pulp
The primary lymphoid tissues include
a. the bone marrow.
b. the thymus.
c. the bone marrow and thymus.
d. the lymph nodes and tonsils.
e. the bone marrow, thymus, spleen and lymph nodes.
the bone marrow and thymus
Lymphocytes that destroy foreign cells or virus-infected cells are ________ cells.
a. plasma
b. B
c. helper T
d. cytotoxic T
e. suppressor T
, cytotoxic T
The body's innate defenses include all of the following except
a. the skin.
b. complement.
c. interferon.
d. inflammation.
e. antibodies.
antibodies
The effects of activating the complement system include all of the following except
a. destruction of target cell plasma membranes.
b. stimulation of inflammation.
c. inhibition of the immune response.
d. opsonization.
e. chemotaxis.
inhibition of the immune response
Immunity that results from exposure to an antigen in the environment is called ________ immunity.
a. naturally acquired active
b. naturally acquired passive
c. artificially acquired active
d. artificially acquired passive
e. innate
naturally acquired active
The following are steps in the cell-mediated immune response. What is the correct sequence for these
steps?
1-Several cycles of mitosis occur
2-Antigen is engulfed and presented by a macrophage
3-Cytotoxic T cells migrate to the focus on infection
4-T cells with specific receptors recognize the antigen
5-T cells differentiate into cytotoxic T cells or T memory cells
6-Cytotoxic T cells release perforin and/or lymphotoxin.
a. 4, 1, 5, 3, 6, 2
b. 2, 4, 1, 5, 3, 6
c. 1, 2, 4, 5, 3, 6
d. 3, 2, 4, 1, 5, 6
e. 3, 6, 4, 5, 1, 2
2, 4, 1, 5, 3, 6
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