Correct Answer: B

Rationale: The correct answer is B because the image formed on the retina is indeed upside down and reversed from its actual appearance in the outside world due to the way light rays are refracted and focused by the cornea and lens. This phenomenon is known as the inverted retinal image. Choice A is incorrect as visual pathways cross at the optic chiasm, so the right side of the brain interprets vision for the left visual field from both eyes. Choice C is incorrect as light rays are refracted at the cornea and lens, not through the transparent media of the eye before striking the pupil. Choice D is incorrect as light impulses are conducted through the optic nerve to the occipital lobes, not the temporal lobes, where the primary visual cortex is located.

Correct Answer: C

Rationale: The correct answer is C: The purpose of cerumen is to protect and lubricate the ear. Cerumen, commonly known as earwax, acts as a natural barrier to prevent dust, debris, and microorganisms from entering the ear canal. It also helps to lubricate the skin in the ear canal and prevent dryness and itching. Choice A is incorrect because sticky, honey-colored cerumen is not necessarily a sign of infection; it can occur due to various factors. Choice B is incorrect as the presence of cerumen does not solely indicate poor hygiene; everyone produces earwax regardless of hygiene practices. Choice D is incorrect as cerumen can sometimes block the ear canal and impair sound transmission rather than aid it.

Correct Answer: D

Rationale: The correct answer is D because dry, flaky cerumen can indicate a change in cilia in the ear canal, potentially leading to conductive hearing loss. This warrants further assessment by the nurse to ensure the patient's aural health is not compromised. A: Eczema lesions typically present differently and are not directly related to dry cerumen. B: While hygiene can contribute to cerumen buildup, dry, flaky cerumen alone does not necessarily indicate poor hygiene. C: Dry, flaky cerumen is not considered a normal finding in a healthy ear and should prompt further evaluation.

Correct Answer: C

Rationale: The correct answer is C: Pull the pinna up and back before inserting the speculum. This is because pulling the pinna up and back straightens the auditory canal, allowing for easier and more accurate insertion of the speculum without causing discomfort or injury. Option A is incorrect as tilting the head forward may obstruct the view. Option B is incorrect as maintaining traction is essential for stability. Option D is incorrect as using the smallest speculum may not provide a clear view or proper insertion depth.

Correct Answer: A

Rationale: The correct answer is A: Teeth that appear shorter. As people age, teeth naturally wear down and may appear shorter due to years of use. This is a normal part of the aging process. B: A smoother tongue is not a typical age-related change. C: Beefy red buccal mucosa may be indicative of an underlying health issue, not solely related to aging. D: A painless lump on the tongue could be a sign of a more serious condition and should be investigated further.