When measuring a patient's visual acuity, the nurse is assessing which cranial nerve?
I
II
IV
III
The Correct Answer is B
A. I: Cranial nerve I, the olfactory nerve, is responsible for the sense of smell and is not involved in visual acuity; it can be tested by asking the patient to identify familiar scents.
B. II: Cranial nerve II, the optic nerve, is responsible for transmitting visual information from the retina to the brain. It is directly involved in measuring visual acuity, as it enables the nurse to assess how well the patient can see and interpret visual stimuli; visual acuity is commonly tested using the Snellen chart.
C. IV: Cranial nerve IV, the trochlear nerve, controls the superior oblique muscle, which is responsible for downward and lateral eye movement. It can be assessed by having the patient follow an object in a downward diagonal direction.
D. III: Cranial nerve III, the oculomotor nerve, controls most of the eye's movements, including constriction of the pupil and maintaining an open eyelid. It is assessed by evaluating the patient's ability to follow objects in all directions and checking for pupil response to light and accommodation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Pericardial sac: The pericardial sac, also known as the pericardium, is a double-walled sac that surrounds and protects the heart. It consists of an outer fibrous layer and an inner serous layer, which produces pericardial fluid to reduce friction between the heart and surrounding structures during heartbeats. This structure provides support and helps maintain the position of the heart within the thorax.
B. Endocardial sac: The endocardium is the innermost layer of the heart wall that lines the heart chambers and covers the heart valves. It does not refer to a protective sac surrounding the heart.
C. Pleural sac: The pleural sac consists of two layers (visceral and parietal pleura) that encase the lungs and provide a lubricated surface for lung expansion and contraction during respiration. It is not related to the heart.
D. Myocardial sac: The myocardium refers to the muscular middle layer of the heart wall responsible for contraction and pumping blood. It is not a sac and does not surround or protect the heart.
Correct Answer is A
Explanation
A. Thyroid: The thyroid gland produces thyroxine (T4) and triiodothyronine (T3), which are essential hormones that regulate metabolism, growth, and development. An elevated T4 level typically indicates hyperthyroidism or other thyroid disorders, making it necessary to assess the function and health of the thyroid gland.
B. Parathyroid: The parathyroid glands regulate calcium levels in the blood through the secretion of parathyroid hormone (PTH). They do not produce T4 or directly influence thyroid hormone levels, so assessing the parathyroid glands would not be relevant in the context of elevated T4.
C. Adrenal: The adrenal glands produce hormones such as cortisol, aldosterone, and adrenaline. While adrenal function can impact overall hormonal balance in the body, they are not directly involved in the production of thyroxine (T4), making them unrelated to the assessment for elevated T4 levels.
D. Parotid: The parotid glands are major salivary glands that secrete saliva. They do not play a role in thyroid hormone production or regulation, so assessing the parotid glands would not be appropriate when investigating elevated T4 levels.
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