Which of the following statements best describes the primary function of the immune system?
The immune system is responsible for regulating body temperature and blood pressure.
The immune system is involved in digestion and absorption of nutrients from food.
The immune system is responsible for recognizing and defending against foreign invaders, such as pathogens and toxins.
The immune system is involved in producing hormones that control various bodily functions.
The Correct Answer is C
Explanation: The immune system is a complex network of cells, tissues, and organs that work together to identify and respond to foreign substances in the body, including bacteria, viruses, parasites, and toxins. Its primary function is to protect the body from infections and other harmful substances.
Incorrect choices:
a. The regulation of body temperature and blood pressure is primarily controlled by the nervous and endocrine systems, not the immune system.
b. Digestion and absorption of nutrients from food are processes mainly controlled by the digestive system, not the immune system.
d. The production of hormones that control bodily functions is primarily the responsibility of the endocrine system, not the immune system.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Explanation: T cells are a type of lymphocyte that plays a central role in cell-mediated immunity. They can recognize and destroy abnormal cells, including cancer cells, through direct cell-to-cell interactions.
Incorrect choices:
b. B cells produce antibodies in response to specific pathogens, but they do not directly attack cancer cells.
c. Antibodies are protein molecules that can bind to specific antigens on pathogens, but they do not have a direct role in attacking cancer cells.
d. Macrophages are phagocytic cells that engulf and destroy foreign substances, including pathogens, but they are not the primary cells responsible for recognizing and attacking cancer cells.
Correct Answer is B
Explanation
Explanation: The primary role of B cells during the humoral immune response is to produce antibodies against specific antigens on pathogens. When B cells encounter an antigen that matches their specific receptor, they become activated and differentiate into plasma cells, which then secrete large amounts of antibodies into the bloodstream.
Incorrect choices:
a. Antigen presentation to B cells is carried out by antigen-presenting cells, such as macrophages and dendritic cells, not by B cells themselves.
c. Directly attacking and killing infected cells is the role of cytotoxic T cells during cell-mediated immunity, not B cells during the humoral immune response.
d. The regulation of the immune response is mainly the function of regulatory T cells (Tregs) and other immune regulatory mechanisms, not the primary role of B cells.
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