Describe the six functionally distinct phases of B-cell development
What will be an ideal response?
(1) Repertoire assembly: Bone marrow expression of diverse B-cell receptors. (2) Negative selection: Modification, elimination or inactivation of autoreactive B cells. (3) Positive selection: Selection of a small subset of immature B cells to become mature B cells in secondary lymphoid organs. (4) Searching for infection: Patrolling for infectious material by recirculating continuously between lymph, blood and secondary lymphoid organ compartments. (5) Finding infection: B cells become activated by antigen in secondary lymphoid tissues and then undergo clonal expansion. (6) Attacking infection: B cells differentiate into plasma cells and memory cells in secondary lymphoid tissues.
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Which of the following terms means a yellow fatty deposit of lipids in an artery?
A) arterioma B) ischemia C) plaque D) stent
Sports medicine specialists believe that many muscular/skeletal problems and injuries, especially in adults, are related to a lack of ____
a. strength b. cardiorespiratory endurance c. flexibility d. balance e. coordination
All of the following are things that might influence students' health behaviors except:
A. Media B. Heroes C. Technology and culture D. all of the choices are correct
?A common factor among people who live to be at least 100 years old is that they handle stress well.
Answer the following statement true (T) or false (F)