Complement proteins:
All of the answers are correct
Attract phagocytes
Promote inflammation
Destroy cells
The Correct Answer is A
A. All of the answers are correct — Complement proteins are part of the immune system and contribute to defense in multiple ways:
B. They attract phagocytes to the site of infection through chemotaxis, enhancing the immune response.
C. They promote inflammation by increasing vascular permeability and attracting immune cells.
D. They can destroy cells by forming the membrane attack complex (MAC), which creates pores in the membranes of pathogens, leading to cell lysis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["C","D"]
Explanation
A. Neutrophils are part of the second line of defense, not the first. They are white blood cells that respond to infection by phagocytosing pathogens after they have entered the body.
B. Inflammation is part of the second line of defense. It is an immune response that occurs after a pathogen has breached the body's barriers.
C. Tears are part of the first line of defense. They contain enzymes like lysozyme that help wash away and destroy pathogens on the surface of the eye.
D. Saliva is part of the first line of defense. It contains enzymes and antimicrobial substances that help neutralize and flush out pathogens from the mouth.
Correct Answer is A
Explanation
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.
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