Which type of cell is primarily responsible for producing antibodies?
T cells
B cells
Macrophages
Natural killer cells
The Correct Answer is B
A. T cells: T cells are primarily involved in cell-mediated immunity. They help regulate immune responses and destroy infected or abnormal cells but do not directly produce antibodies.
B. B cells: B cells are responsible for humoral immunity and differentiate into plasma cells that secrete antibodies. These antibodies bind to specific antigens to neutralize or mark them for destruction by other immune cells.
C. Macrophages: Macrophages are phagocytic cells that engulf pathogens and present antigens to lymphocytes. They support the immune response but do not produce antibodies themselves.
D. Natural killer cells: Natural killer cells destroy infected or cancerous cells through cytotoxic activity. They are part of innate immunity and do not generate antibodies.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Medulla oblongata: The medulla oblongata controls autonomic functions such as heart rate, breathing, and blood pressure. It is not primarily responsible for coordination or balance.
B. Cerebrum: The cerebrum manages higher brain functions, including thought, memory, and voluntary movement planning. While it initiates movement, it does not directly coordinate balance or fine motor control.
C. Hypothalamus: The hypothalamus regulates homeostatic processes like temperature, hunger, thirst, and hormonal control. It is not involved in motor coordination or balance.
D. Cerebellum: The cerebellum coordinates voluntary movements, maintains posture, and ensures balance and equilibrium. It processes input from sensory systems and the cerebrum to fine-tune motor activity, making it essential for coordinated movement.
Correct Answer is C
Explanation
A. Through direct neural connections: The hypothalamus communicates with the posterior pituitary via neural connections, not the anterior pituitary, which relies on hormonal signaling.
B. Through the secretion of melatonin: Melatonin is produced by the pineal gland and does not mediate communication between the hypothalamus and anterior pituitary.
C. Through releasing and inhibiting hormones via the hypophyseal portal system: The hypothalamus secretes specific releasing and inhibiting hormones into the hypophyseal portal blood vessels, which carry them directly to the anterior pituitary to regulate hormone production and release.
D. Through the secretion of insulin: Insulin is secreted by the pancreas and does not play a role in hypothalamic communication with the anterior pituitary.
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