A vaccine is effective because
the vaccine contains the lymphocytes necessary to fight infection
B-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen
the secondary response of the adaptive immunity is faster and more efficient than the primary response
the vaccine contains the antibodies necessary to fight infection
The Correct Answer is C
A. The vaccine contains the lymphocytes necessary to fight infection: Vaccines do not contain preformed lymphocytes. Instead, they provide antigens that stimulate the body’s own lymphocytes to develop immunity, allowing the adaptive immune system to respond effectively upon future exposure.
B. B-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen: B cells can respond during the primary exposure, but the response is slower and less robust. Vaccines work by preparing the immune system for a faster, stronger secondary response, rather than because B cells are incapable of a primary response.
C. The secondary response of the adaptive immunity is faster and more efficient than the primary response: Vaccines stimulate memory B and T cells, which allow the immune system to mount a rapid and effective response upon subsequent exposure to the pathogen. This secondary response provides long-lasting immunity and is the primary reason vaccines are effective.
D. The vaccine contains the antibodies necessary to fight infection: Vaccines do not contain antibodies; they contain antigens or inactivated pathogens that stimulate the body to produce its own antibodies. Preformed antibodies would provide temporary protection but not long-term immunity.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Appendix:The appendix contains lymphoid tissue but is located in the lower right abdomen and is not associated with the oral cavity.
B. Thymus:The thymus is a primary lymphoid organ in the mediastinum where T cells mature. It does not presentas mucosal swelling in the oral cavity.
C. Peyer's patch:Peyer’s patches are lymphoid nodules in the small intestine that monitor intestinal antigens. They are not found in the oral cavity.
D. Tonsil:Tonsils are secondary lymphoid organs located in the pharyngeal region of the oral cavity. They appear as mucosal swellings and help trap and respond to inhaled or ingested pathogens, making them the correct choice.
Correct Answer is A
Explanation
A. Veins only carry blood low in oxygen:This statement is false because pulmonary veins carry oxygenated blood from the lungs to the heart. Not all veins carry deoxygenated blood; the oxygen content depends on the circulation pathway.
B. Veins are our blood reservoirs:Veins are capacitance vessels that can hold large volumes of blood, acting as reservoirs. This property helps maintain circulatory stability and allows the body to adjust blood distribution as needed.
C. Blood pressure is low in veins:Venous pressure is significantly lower than arterial pressure because veins are farther from the pumping action of the heart and have thinner walls with less smooth muscle.
D. Veins have valves:Many veins, especially in the limbs, contain valves that prevent backflow and assist in returning blood to the heart against gravity. These valves are crucial for maintaining unidirectional flow.
E. There are no exceptions, all of the above are true:This is incorrect because statement A is false; veins do not exclusively carry deoxygenated blood.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.