An older adult is newly diagnosed with primary hypertension and has just been started on a beta-blocker. The nurse's health education should include which of the following?

Correct Answer: C

Rationale: Elderly people have impaired cardiovascular reflexes and are more sensitive to postural hypotension. The nurse teaches patients to change positions slowly when moving from lying or sitting positions to a standing position, and counsels elderly patients to use supportive devices as necessary to prevent falls that could result from dizziness. Lifestyle changes, such as regular physical activity/exercise, and a diet rich in fruits, vegetables, and low-fat dairy products, is strongly recommended. Increasing fluids in elderly patients may be contraindicated due to cardiovascular disease. Increased intracranial pressure is not a risk and activity should not normally be limited.

Correct Answer: C

Rationale: NO synthase is inactivated by haemoglobin, which binds to nitric oxide and reduces its bioavailability.

Correct Answer: B

Rationale: The volume of blood pumped through the lungs equals the volume exiting the heart, not entering it.

Correct Answer: B

Rationale: The correct sequence of conduction is SA node -> AV node -> AV bundle -> Bundle branches -> Purkinje fibers.