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 B
Explanation
A. The number of hair follicles does not increase with age. In fact, there is a gradual decrease in the number of hair follicles as one ages.
B. Decreased sebum production is a common skin change associated with aging. Sebum helps keep the skin moisturized, and as its production decreases with age, the skin tends to become drier.
C. Skin elasticity actually decreases with age due to the breakdown of collagen and elastin fibers, leading to wrinkles and sagging.
D. Epidermal permeability tends to increase with age, as the skin becomes thinner and more fragile, making it easier for substances to pass through.
Correct Answer is A
Explanation
A. Dense regular connective tissue consists of fibroblasts arranged tightly between parallel arrays of collagen fibers. This structure provides tensile strength in one direction, which is found in tendons and ligaments.
B. Dense irregular connective tissue also contains collagen fibers, but these fibers are arranged in an irregular, non-parallel pattern, allowing the tissue to withstand tension from multiple directions, such as in the dermis of the skin.
C. Elastic connective tissue contains a higher proportion of elastin fibers, which provide stretch and recoil. It is found in structures like the walls of large arteries, but not in parallel arrays of collagen fibers.
D. Reticular connective tissue consists of a network of thin, branching collagen fibers, providing structural support in organs like the spleen and lymph nodes, but it does not have tightly packed fibroblasts between parallel collagen fibers.
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