Which of the following produce memory cells that trigger a strong response to future exposures to the same antigen?
A. Macrophages and lymphocytes
B. T cells
C. Eosinophil
D. Natural killer (NK) cells
E. Complements
B. T cells
Some activated T cells become memory T cells that "remember" the pathogen that activated the original T cell. When a person is later exposed to the same pathogen, memory cells trigger an immune response that is more effective than the first response.
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Foam lowers surface tension of water, allowing it to ___ fires in Class A materials
A. cool B. smother C. suppress D. penetrate
Erythropoietin increases the number of red cells by all of the following mechanisms except:
a. Prolonging cell life span b. Shortening cell division times c. Allowing earlier cell egress from the bone marrow d. Increasing the rate of hemoglobin synthesis
Calcium is needed in the body for:
A. proper thyroid function. B. the bones and teeth. C. carbohydrate use. D. prevention of anemia.
When the chest impacts the steering wheel during a motor vehicle crash with rapid deceleration, the resulting injury that kills almost one third of patients, usually within seconds, is:
A. a hemothorax. B. aortic shearing. C. a pneumothorax. D. a ruptured myocardium.