Which immune cell stays after an infection is gone in order to produce antibodies?
Memory T cell
Memory B Cell
Natural killer cell
Mast cell
The Correct Answer is B
A. Memory T cell: Memory T cells are important for the adaptive immune response and provide cellular immunity but are not responsible for producing antibodies.
B. Memory B Cell: Memory B cells remain in the body after an infection has been cleared and are responsible for producing specific antibodies upon re-exposure to the same pathogen.
C. Natural killer cell: Natural killer cells are part of the innate immune system and function to kill virally infected cells and tumors but do not produce antibodies or have memory capabilities.
D. Mast cell: Mast cells are involved in allergic reactions and defense against parasites but do not produce antibodies and are not part of the memory response.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Parietal Cell: Parietal cells are responsible for secreting hydrochloric acid (HCl) and intrinsic factor, not pepsinogen. HCl activates pepsinogen into pepsin.
B. Mucous Neck Cell: Mucous neck cells secrete mucus to protect the gastric lining but do not secrete pepsinogen.
C. Chief Cell: Chief cells (also known as zymogenic cells) are specialized cells in the stomach that secrete pepsinogen, the inactive precursor of the digestive enzyme pepsin.
D. Enteroendocrine Cell: Enteroendocrine cells secrete hormones like gastrin, which regulates digestive processes, but they do not secrete pepsinogen.
Correct Answer is A
Explanation
A. This allows for rapid exchange of oxygen and nutrients: Capillaries have thin walls (one cell thick) to facilitate the rapid diffusion of gases (oxygen and carbon dioxide), nutrients, and waste products between blood and tissues.
B. This allows for red blood cell formation to occur: Red blood cells are formed in the bone marrow, not in capillaries.
C. There is no blood pressure within the capillaries: There is still blood pressure within capillaries, although it is lower than in arteries, so this is incorrect.
D. Blood does not travel through capillaries: Blood does indeed travel through capillaries as part of the circulatory system.
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