The formation of blackheads on the skin is a result of blockage of which of the following types of gland?
Lacrimal
Sebaceous
Sweat
Ceruminous
The Correct Answer is B
A. Lacrimal glands produce tears and are not involved in the formation of blackheads.
B. Sebaceous glands secrete sebum, an oily substance that can clog hair follicles when produced in excess. This blockage, combined with oxidation, leads to the formation of blackheads on the skin.
C. Sweat glands produce sweat and are not involved in the formation of blackheads, which result from excess sebum and not sweat.
D. Ceruminous glands secrete earwax (cerumen) and are not involved in blackhead formation, as they are located in the ear canal and not on the skin's surface.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The trochlear nerve (IV) controls the superior oblique muscle of the eye and is not responsible for sensation or pain in the face.
B. The trigeminal nerve (V) is responsible for sensation in the face, including pain, tingling, and touch. It also controls the muscles of mastication. A lesion or irritation of this nerve can lead to symptoms like pain and tingling in the face.
C. The glossopharyngeal nerve (IX) primarily controls the sensation in the throat and the taste sensation on the back of the tongue. It is not responsible for facial pain or tingling.
D. The abducens nerve (VI) controls the lateral rectus muscle of the eye, responsible for eye movement, but does not contribute to facial sensation.
Correct Answer is C
Explanation
A. As previously noted, the length of the thoracic cavity increases, not decreases, during the contraction of inspiratory muscles.
B. The diaphragm moves downward (not upward) when it contracts, allowing the lungs to expand.
C. The contraction of the diaphragm and external intercostals increases the diameter of the thoracic cavity, providing space for the lungs to expand and fill with air. This is the correct answer.
D. The chest cavity does not compress the lungs during inspiration; instead, it expands to accommodate the lungs as they fill with air.
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