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The lymphatics function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream.
Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics.
The distal portion of the small intestine contains clumps of lymph follicles called ________.
What effect does age have on the size of the thymus?
The thymus initially increases in size and then decreases in size from adolescence through old age.
Select the correct statement about lymphocytes.
B cells produce plasma cells, which secrete antibodies into the blood.
A ring of lymphoid tissue that appears as a swelling of the mucosa in the oral cavity is called a(n) ________.
Which of the following is characteristic of antibodies?
composed of heavy and light polypeptide chains
Which of the following is associated with passive immunity?
passage of IgG antibodies from a pregnant mother to her fetus
Which of the following is not a function of the inflammatory response?
replaces injured tissues with connective tissue
The system that recognizes foreign molecules and acts to immobilize, neutralize, or destroy them is the ________.
The process whereby neutrophils and other white blood cells are attracted to an inflammatory site is called ________.
________ are released by activated T cells and macrophages to mobilize immune cells and attract other leukocytes into the area.
B cells respond to the initial antigen challenge (primary response) by ________.
producing progeny cells that include plasma cells and memory cells
Cancer cells and virus-infected body cells can be killed before activation of adaptive immunity by ________.
natural killer cells
Which of the following is not characteristic of the adaptive immune system?
It is specific for a given organ.
is the ability of individual cells to recognize a specific antigen by binding to it
Select the correct statement about active and passive immunity.
Active and passive humoral immunity are both mechanisms of specific immunity that use antibodies.
The primary immune response ________.
has a lag period while B cells proliferate and differentiate into plasma cells
Which of the following is true about the number of binding sites per functional antibody unit?
IgM contains 10 binding sites.
Complement proteins and antibodies coat a microorganism and provide binding sites, enabling macrophages and neutrophils to phagocytize the organism. This phenomenon is termed ________.
Which of the following would most likely increase a person's risk of invasion by pathogenic microges?
loss of epidermal tissure
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