Correct Answer: B

Rationale: The correct answer is B: 7th cranial nerve. Bell's palsy is caused by inflammation of the facial nerve (7th cranial nerve), leading to facial muscle weakness or paralysis. The 3rd cranial nerve (choice A) controls eye movement, the 5th cranial nerve (choice C) is responsible for facial sensation and chewing, and the 8th cranial nerve (choice D) is related to hearing and balance. Bell's palsy specifically affects the facial muscles, making choice B the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Oxygen. Oxygen is primarily transported in the blood bound to hemoglobin within red blood cells, not dissolved in plasma. Carbon dioxide is transported in plasma. Nutrients and hormones are also transported in plasma. Therefore, choice A is incorrect as oxygen is not primarily transported in plasma.

Correct Answer: A

Rationale: The correct answer is A: Norepinephrine. Norepinephrine is the primary neurotransmitter that mediates the sympathetic response. It is released by sympathetic nerve endings and acts on adrenergic receptors in various target organs to initiate the "fight or flight" response. Prostaglandin, acetylcholine, and serotonin do not directly mediate the sympathetic response and are involved in different physiological processes.

Correct Answer: D

Rationale: Step 1: Monitoring Mrs. GC's color, pulse, and respiration is important to assess for any signs of distress during the procedure. Step 2: Labeling all laboratory specimens in numerical order ensures accurate identification and prevents errors in specimen handling. Step 3: Positioning Mrs. GC on her side with knees drawn up to her chest helps maintain proper spinal alignment and reduces the risk of complications. Summary: Option D is correct because all the interventions mentioned are crucial for ensuring patient safety and procedural success. Options A, B, and C are incorrect individually as they each address only one aspect of the procedure, whereas the correct answer encompasses all necessary interventions.

Correct Answer: B

Rationale: The correct answer is B: Isolated systolic hypertension. This is because in isolated systolic hypertension, the systolic blood pressure is elevated while the diastolic blood pressure remains normal. This condition is common in older adults and is often related to aging and stiffening of the arteries. Primary hypertension (A) typically involves both elevated systolic and diastolic pressures. Secondary hypertension (C) is caused by an underlying condition. Hypertensive emergency (D) is characterized by severe elevations in both systolic and diastolic pressures with acute target organ damage.