B cells divide and differentiate into:
Megakaryocytes.
Plasma cells.
Antibodies.
T cells produce and secrete antibodies.
The Correct Answer is B
B cells are a type of lymphocyte that originate from the bone marrow and are involved in humoral immunity.
When they encounter a foreign substance (antigen), they differentiate into plasma cells, which secrete antibodies.
Antibodies are proteins that bind to the antigen and neutralize it.
Choice A is wrong because megakaryocytes are large cells that produce platelets, not antibodies.
Choice C is wrong because antibodies are not cells, but products of plasma cells.
Choice D is wrong because T cells are another type of lymphocyte that originate from the thymus and are involved in cell-mediated immunity, not antibody production.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Exocrine glands secrete through ducts or tubes to the body’s exterior.
For example, sweat glands, salivary glands, and liver are exocrine glands.
Choice A is wrong because exocrine glands do not only secrete salts, but also other substances such as enzymes, mucus, and sebum.
Choice B is wrong because exocrine glands do not secrete hormones at all.
Hormones are secreted by endocrine glands, which are ductless glands that release their products directly into the bloodstream.
Choice C is wrong because exocrine glands do not secrete into the bloodstream, but onto an epithelial surface such as the skin or the gastrointestinal tract.
Only endocrine glands secrete into the bloodstream.
Correct Answer is B
Explanation
Circulation is the movement or flow of something, especially blood or air, through a circuit or a specific course.
Circulation supplies oxygen and nutrients to and removes wastes from tissues. This is essential for the survival and functioning of cells and organs.
Choice A is wrong because circulation does not inflate the lungs.
The lungs are inflated by the pressure difference between the air inside and outside the chest cavity.
Choice C is wrong because circulation does not deliver waste to tissues.
Circulation removes wastes from tissues and delivers them to the excretory organs such as the kidneys and the lungs.
Choice D is wrong because circulation does not deliver carbon dioxide to tissues and removes excess oxygen.
Circulation does the opposite: it delivers oxygen to tissues and removes carbon dioxide.
Carbon dioxide is a waste product of cellular respiration that needs to be eliminated from the body.
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