These T cells recognize an antigen and initiate a rapid response to the antigen:
Killer T cells
Regulatory T cells
Memory T cells
Thrombocytes
The Correct Answer is A
A. Killer T cells (also known as cytotoxic T cells) recognize and bind to antigens presented by infected cells. They initiate a rapid immune response to destroy the infected or cancerous cells directly.
B. Regulatory T cells help modulate the immune response by preventing overreaction or autoimmunity, but they do not directly initiate a rapid response to antigens.
C. Memory T cells remember previously encountered antigens and respond quickly upon re-exposure to the same pathogen, but they do not initiate the initial response—they are involved in secondary immune responses.
D. Thrombocytes (also known as platelets) are involved in blood clotting, not in the immune response to antigens.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Serum sickness is the correct answer. It is a type III hypersensitivity reaction that can occur when the body reacts to proteins in animal-derived immune serum, often used in treatments like antitoxins or antivenoms. Symptoms may include rash, fever, joint pain, and swelling.
B. Rejection syndrome typically refers to the immune system's rejection of transplanted organs or tissues, not a response to serum.
C. Kaposi sarcoma is a cancer associated with human herpesvirus 8 (HHV-8), most commonly seen in immunocompromised individuals, such as those with AIDS. It is unrelated to immune serum reactions.
D. Hay fever (allergic rhinitis) is an allergic reaction to airborne substances like pollen, not to animal-derived serum
Correct Answer is C
Explanation
A. Pharyngeal tonsils (also called adenoids) are located in the nasopharynx, not at the back of the tongue.
B. Palatine tonsils are located on either side of the back of the throat, not at the back of the tongue.
C. Lingual tonsils are small mounds of lymphoid tissue located at the base of the tongue, and they help protect the body from pathogens entering through the oral cavity.
D. Adenoids are another term for the pharyngeal tonsils, which are located in the nasopharynx, not at the back of the tongue.
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