The nurse is caring for a patient who just returned from surgical decompression of the carpal tunnel. Which finding requires the nurse's immediate action?

Correct Answer: C

Rationale: The correct answer is C because a capillary refill time of 8 seconds indicates poor perfusion, which could be a sign of compromised blood flow to the fingers post-surgical decompression. This finding requires immediate action to prevent complications such as ischemia or impaired wound healing. A: Swollen and warm fingers are expected after surgery due to inflammation. B: Generalized pain can be managed with appropriate pain relief measures and is not an immediate concern post-surgery. D: Pink and cool fingers indicate adequate perfusion and are normal findings post-surgery.

Correct Answer: D

Rationale: The correct answer is D because Signal 2 is essential for the activation of naïve T cells. Signal 1 provides the antigen recognition, while Signal 2, typically provided by co-stimulatory molecules, is required for full T cell activation. A is incorrect because Signal 2 is not specifically for memory T cell re-activation. B is incorrect because Signal 2 is not related to self-tolerance, which is typically maintained by regulatory T cells. C is incorrect because CD3 is a component of the T cell receptor complex, not the primary mediator of Signal 2.

Correct Answer: B

Rationale: The correct answer is B because mature naïve T cells that leave the thymus can include self-reactive T cells that have not been tolerized against a specific antigen. This is because the process of negative selection in the thymus eliminates most self-reactive T cells but does not catch all of them. Some self-reactive T cells may escape negative selection and circulate as mature naïve T cells. Therefore, it is possible for mature naïve T cells leaving the thymus to include self-reactive T cells that have not been tolerized against a specific antigen. Choices: A: This is incorrect because although negative selection in the thymus eliminates most self-reactive T cells, it does not catch all of them, so some self-reactive T cells may still be present in the mature naïve T cell population. C: This is incorrect because mature naïve T cells already have the ability to recognize antigens presented by MHC, which is developed in the th

Correct Answer: D

Rationale: The correct answer is D, "All of the above A, B, and C". Step 1: Induction of a neutralizing antibody response (A) is crucial as it helps prevent the virus from infecting cells. Step 2: Induction of a cytotoxic T cell response (B) is important to eliminate infected cells and stop the spread of the virus. Step 3: Protection against multiple strains (C) is desirable to ensure broad coverage against different flu strains. Combining A, B, and C in a vaccine would provide comprehensive protection against the flu by targeting different aspects of the immune response. Choices A, B, and C are incorrect individually as they each address only one aspect of a desirable flu vaccine, whereas the correct answer D encompasses all three crucial features.

Correct Answer: C

Rationale: The correct answer is C: Increasing pathogen reproduction. The immune system's main function is to protect the body from pathogens and foreign invaders, not to promote their reproduction. A: Promoting wound healing is correct as the immune system helps in tissue repair. B: Fighting cancer is correct as the immune system plays a role in recognizing and destroying cancerous cells. D: Eliminating cell debris is correct as the immune system helps in clearing out dead or damaged cells to maintain tissue health.