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 D
Explanation
A. The tricuspid valve has three leaflets and is located between the right atrium and right ventricle. It closes during ventricular contraction (systole) but does not have two leaflets.
B. The pulmonic valve has three leaflets and controls blood flow from the right ventricle to the pulmonary artery. It is closed during the systolic phase but is not the correct answer for having two leaflets.
C. The aortic valve has three leaflets and controls blood flow from the left ventricle into the aorta. It also closes during systole, but it does not have two leaflets.
D. The mitral valve, also known as the bicuspid valve, has two leaflets and is located between the left atrium and left ventricle. It closes during systole to prevent backflow of blood into the left atrium.
Correct Answer is B
Explanation
A. Dehydroepiandrosterone (DHEA) and estradiol are hormones related to sex and stress but are not primarily involved in the fight-or-flight response.
B. Epinephrine (adrenaline) and norepinephrine are the key hormones released by the adrenal medulla during the fight-or-flight response. These hormones increase heart rate, blood pressure, and energy supply to prepare the body for rapid action in stressful situations. This is the correct answer.
C. Ghrelin and kisspeptin are involved in hunger and reproductive functions, not the acute stress response.
D. Insulin and glucagon are involved in regulating blood sugar, but they are not the primary hormones released during the fight-or-flight response.
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