a&p II

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Lymph capillaries are absent in all but which of the following?
A) bone marrow B) bones and teeth
C) CNS D) digestive organs

Answer: D

The thymus is the only lymphoid organ that does not:
A) have a cortex and medulla B) produce hormones
C) have lymphocytes D) directly fight antigens

Answer: D

Large clusters of lymph nodes occur in all of the following locations except the ________.
A) axillary region B) cervical region
C) inguinal region D) lower extremities

Answer: D

Which of the following is not a method that maintains lymph flow?
A) breathing B) smooth muscle contraction
C) skeletal muscle contraction D) valves in lymph vessel walls

Answer: B

How do the lymph capillaries differ from blood capillaries?

Answer: Although similar to blood capillaries, lymphatic capillaries differ structurally in the
following ways: (1) The endothelial cells forming the walls of lymphatic capillaries
are not tightly joined. Their edges loosely overlap one another, forming flaplike
minivalves. (2) Bundles of fine filaments anchor the endothelial cells to surrounding
structures so that any increase in interstitial fluid volume separates the cell flaps,
exposing gaps in the wall rather than causing the lymphatic capillary to collapse.

Which of the following are functions of lymphoid tissue? A) house and provide a proliferation site for lymphocytes
B) house and provide a proliferation site for neutrophils
C) furnish an ideal surveillance vantage point for lymphocytes and macrophages
D) A and C

Answer: D

Which of the following is not a function of the lymphatic system?
A) carrying out immune responses B) transporting respiratory gases
C) draining excess interstitial fluid D) transporting dietary fats

B

Which of the following is not a function of lymph nodes? A) serve as antigen surveillance areas
B) produce lymph fluid and cerebro-spinal fluid
C) produce lymphoid cells and granular WBCs
D) act as lymph filters and activate the immune system

B

How is the skeletal system tied to the lymphatic system?

Answer: 1. The lymphatic system removes excess fluids in the periostea.
2. The lymphocytes protect the bones from pathogens.
3. Parts of the skeletal system produce the lymphocytes found in the lymphatic
system.

Explain the term MALT. What is its function?

Answer: MALT is an acronym for mucosa-associated lymphatic tissue. It includes Peyer's
patches, the appendix, and the tonsils in the digestive tract, lymphoid follicles in the
walls of the bronchi, and genitourinary tract. Collectively, MALT protects passages
open to the exterior from foreign matter entering them.

How do the lymph capillaries differ from blood capillaries?

Answer: Although similar to blood capillaries, lymphatic capillaries differ structurally in the
following ways: (1) The endothelial cells forming the walls of lymphatic capillaries
are not tightly joined. Their edges loosely overlap one another, forming flaplike
minivalves. (2) Bundles of fine filaments anchor the endothelial cells to surrounding
structures so that any increase in interstitial fluid volume separates the cell flaps,
exposing gaps in the wall rather than causing the lymphatic capillary to collapse.

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