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 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 A
Explanation
A. The plasma membrane, also known as the cell membrane, surrounds the cell and encloses the cytoplasm. It acts as a barrier, controlling the movement of substances in and out of the cell.
B. The Golgi apparatus is an organelle that modifies, sorts, and packages proteins and lipids for transport, but it does not enclose the cytoplasm.
C. The endoplasmic reticulum is involved in the synthesis of proteins and lipids within the cell but does not enclose the cytoplasm.
D. The flagellum is a tail-like structure that helps some cells move but does not enclose the cytoplasm.
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