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 C
Explanation
A. The jejunum is the middle part of the small intestine and is primarily involved in nutrient absorption, but it does not receive bile from the common bile duct.
B. The ileum is the final part of the small intestine, responsible for absorbing bile salts and vitamin B12, but it does not directly receive bile from the common bile duct.
C. The common bile duct empties bile into the duodenum, which is the first part of the small intestine. This allows bile to aid in the digestion and emulsification of fats.
D. The stomach is involved in the digestion of food but does not receive bile directly. Bile enters the small intestine, not the stomach
Correct Answer is C
Explanation
A. Luteinizing hormone (LH) is involved in the regulation of the menstrual cycle and ovulation, but it is not responsible for uterine contractions or milk production.
B. Lactogen (also known as human placental lactogen) is produced during pregnancy and helps prepare the breasts for milk production, but it does not trigger uterine contractions.
C. Oxytocin plays a key role in both uterine contractions during labor and milk ejection during breastfeeding. It is sometimes referred to as the "love hormone" because it is also involved in bonding and emotional connections.
D. Prolactin is responsible for stimulating milk production in the mammary glands, but it does not cause uterine contractions. Oxytocin is the hormone responsible for that function.
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