What is the primary effect of histamine?
Decreased respiratory rate
Vasodilation
Bronchodilation
Decreased heart rate
The Correct Answer is B
A. Histamine does not primarily affect the respiratory rate; its main action is on blood vessels and smooth muscle.
B. Histamine is a chemical released during allergic reactions and inflammation, and one of its primary effects is vasodilation, which leads to increased blood flow to affected tissues. This can result in symptoms such as redness and swelling.
C. Histamine generally causes bronchoconstriction, not bronchodilation, which can lead to symptoms such as wheezing and difficulty breathing, especially in conditions like asthma.
D. Histamine does not directly affect heart rate, but it can influence blood pressure through its vasodilatory effects.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Cushing's syndrome is most commonly caused by the hypersecretion of cortisol from the adrenal glands. It can also result from excess production of adrenocorticotropic hormone (ACTH) from the pituitary gland, but the primary issue is often adrenal hypersecretion.
B. While the pituitary gland can contribute to Cushing's syndrome by secreting too much ACTH (which stimulates the adrenal glands), it is the adrenal glands that primarily cause the symptoms of the condition.
C. The parathyroid glands are responsible for regulating calcium levels in the blood, not for the production of cortisol.
D. The thymus plays a role in immune system development, but it is not involved in Cushing's syndrome.
Correct Answer is B
Explanation
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.
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