Lymphatic System and Body Defenses
Correctly Answered
What is the function of lymphatic vessels?
Lymphatic vessels pick up fluid and proteins leaked from the blood into the interstitial
space.
How do lymphatic capillaries and blood capillaries differ structurally from each
other?
Lymphatic capillaries are blind-ended and not fed by arteries as blood capillaries are.
They also have flaplike minivalves that make them more permeable than blood
capillaries.
In which three regions of the body are the lymph nodes most dense?
Particularly large collections of lymph nodes occur in the axillary, inguinal, and cervical
regions.
What anatomical characteristics ensures that lymph flows through the lymph
nodes slowly?
The number of afferent lymphatic vessels entering the node is greater than the number
of efferent vessels leaving the node at the hilum. Therefore, lymph flow stagnates
somewhat.
Which lymphoid organ gets rid of aged red blood cells?
The spleen destroys worn out red blood cells.
What is MALT?
The lymphoid tissue associated with the mucosa---tonsils in the throat, and Peyer's
patches in the intestinal walls---which acts to prevent pathogens from entering the body
through the mucosa. (appendix included)
How do the innate and adaptive defenses differ?
Innate defenses are nonspecific and always ready to protect the body. They include
intact membranes (mucosa, skin), inflammatory response, and several protective cell
types and chemicals. Adaptive defenses must be programmed and specifically target
particular pathogens or antigens.
What are the four common indicators of inflammation?
Redness, heat, swelling (edema), and pain
How does complement cause lysis of a pathogenic microorganism?
It attaches to foreign cells and when it is activated, membrane attack complexes
(MACs) are inserted into the foreign cell's membrane and produce lesions that allow
water entry and cause lysis.
Which type of infectious microorganisms causes the body's level of interferons to
rise?
Viruses elicit interferon formation
What is the difference between an antigen and a self-antigen?
An antigen is a foreign substance in the body. A self-antigen is a body protein, typically
displayed in the plasma membrane, that is foreign to anyone but yourself.
Correctly Answered
What is the function of lymphatic vessels?
Lymphatic vessels pick up fluid and proteins leaked from the blood into the interstitial
space.
How do lymphatic capillaries and blood capillaries differ structurally from each
other?
Lymphatic capillaries are blind-ended and not fed by arteries as blood capillaries are.
They also have flaplike minivalves that make them more permeable than blood
capillaries.
In which three regions of the body are the lymph nodes most dense?
Particularly large collections of lymph nodes occur in the axillary, inguinal, and cervical
regions.
What anatomical characteristics ensures that lymph flows through the lymph
nodes slowly?
The number of afferent lymphatic vessels entering the node is greater than the number
of efferent vessels leaving the node at the hilum. Therefore, lymph flow stagnates
somewhat.
Which lymphoid organ gets rid of aged red blood cells?
The spleen destroys worn out red blood cells.
What is MALT?
The lymphoid tissue associated with the mucosa---tonsils in the throat, and Peyer's
patches in the intestinal walls---which acts to prevent pathogens from entering the body
through the mucosa. (appendix included)
How do the innate and adaptive defenses differ?
Innate defenses are nonspecific and always ready to protect the body. They include
intact membranes (mucosa, skin), inflammatory response, and several protective cell
types and chemicals. Adaptive defenses must be programmed and specifically target
particular pathogens or antigens.
What are the four common indicators of inflammation?
Redness, heat, swelling (edema), and pain
How does complement cause lysis of a pathogenic microorganism?
It attaches to foreign cells and when it is activated, membrane attack complexes
(MACs) are inserted into the foreign cell's membrane and produce lesions that allow
water entry and cause lysis.
Which type of infectious microorganisms causes the body's level of interferons to
rise?
Viruses elicit interferon formation
What is the difference between an antigen and a self-antigen?
An antigen is a foreign substance in the body. A self-antigen is a body protein, typically
displayed in the plasma membrane, that is foreign to anyone but yourself.
