If PO2 increases

Correct Answer: A

Rationale: Step 1: Increased PO2 leads to higher oxygen levels in blood. Step 2: Higher PO2 causes hemoglobin to become fully saturated with oxygen. Step 3: Fully saturated hemoglobin stores more oxygen. Step 4: Therefore, as PO2 increases, saturation goes up and hemoglobin stores more oxygen. Other choices are incorrect because they do not align with the relationship between PO2, hemoglobin saturation, and oxygen storage in the blood.

Correct Answer: A

Rationale: The correct answer is A: Electrocardiogram (ECG or EKG). An ECG is commonly used to assess heart function in heart failure because it provides information on the heart's electrical activity, rhythm, and any abnormalities. It can detect conditions such as arrhythmias, ischemia, and previous heart attacks. Other choices are incorrect: B (MRI) is more for imaging the structure of the heart, C (Colonoscopy) is for examining the colon, and D (Blood glucose test) is for measuring blood sugar levels, not heart function.

Correct Answer: C

Rationale: The correct answer is C: Corniculate cartilage. Corniculate cartilage is a paired cartilage found in the larynx, specifically at the apex of the arytenoids. The other choices, such as cricoid cartilage, epiglottis, and thyroid cartilage, are all unpaired cartilages. Cricoid cartilage is a complete ring, the epiglottis is a leaf-shaped cartilage, and the thyroid cartilage is the largest cartilage in the larynx. Therefore, Corniculate cartilage is the only paired cartilage among the options provided.

Correct Answer: C

Rationale: The phrenic nerve innervates the diaphragm and arises from cervical nerve roots C3 to C5. Choice C is correct as it accurately states that the phrenic nerve is located in the diaphragmatic area and originates from C3 to C5. Choice A is incorrect as it only mentions the diaphragmatic area without specifying the cervical levels. Choice B is incorrect as it only mentions the cervical levels without specifying the diaphragmatic area. Choice D is incorrect as the phrenic nerve does exist.

Correct Answer: D

Rationale: The correct answer is D because lying down after eating can increase the risk of acid reflux and heartburn in patients with emphysema. A: Rest before eating is important as it can reduce shortness of breath during meals. B: Avoiding gas-producing foods can help prevent bloating and discomfort. C: Eating four to six small meals instead of three large meals is beneficial for easier digestion and energy management. In summary, D is incorrect because it can worsen symptoms, while A, B, and C are all helpful strategies for managing nutritional deficits in patients with emphysema.