The metal associated with haemoglobin is

Correct Answer: D

Rationale: The correct answer is D: Iron. Haemoglobin is a protein in red blood cells that carries oxygen throughout the body. Iron is an essential component of haemoglobin, binding to oxygen molecules and facilitating their transport. Sodium, potassium, and calcium do not play a direct role in the structure or function of haemoglobin, making them incorrect choices. Iron deficiency can lead to anemia due to the lack of adequate oxygen-carrying capacity in the blood.

Correct Answer: A

Rationale: The correct answer is A because insurance coverage for CPAP machines is generally not based on the number of hours it is worn per day but rather on medical necessity. The nurse would not include this information as it could lead to misunderstanding and incorrect assumptions. Choice B is incorrect because adjusting the mask may be necessary for comfort. Choice C is correct as CPAP does provide pressure to keep airways open. Choice D is also correct as cleaning the mask regularly is essential to prevent infections.

Correct Answer: B

Rationale: The correct answer is B. Sputum specimens are often examined for cancer cells in cases of suspected lung cancer. While foreign bodies (A) can sometimes be identified, they are less common in routine sputum analysis. Pulmonary emboli (C) cannot be detected via sputum examination; imaging studies are required. Inflammation (D) may be inferred from white blood cell counts, but detecting cancer cells is more specific and clinically significant.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.