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. Pernicious anemia is caused by vitamin B12 deficiency due to impaired absorption, not excessive destruction of erythrocytes.
B. Aplastic anemia results from the bone marrow's inability to produce enough blood cells, leading to a deficiency of all blood cell types, rather than the destruction of erythrocytes.
C. Immunohemolytic anemia is characterized by the immune system mistakenly attacking and destroying the body's own erythrocytes, leading to excessive destruction of red blood cells.
D. Iron-deficiency anemia is caused by insufficient iron to produce hemoglobin, resulting in low red blood cell production, but not excessive destruction of erythrocytes.
Correct Answer is C
Explanation
A. The heart is composed of cardiac muscle tissue, not smooth muscle. Cardiac muscle is specialized for rhythmic contractions to pump blood.
B. The rectus abdominis is composed of skeletal muscle tissue, which is voluntary and allows for movement of the trunk.
C. The esophagus contains smooth muscle tissue in its walls, which is responsible for the involuntary contractions (peristalsis) that move food from the mouth to the stomach.
D. The pectoralis major is composed of skeletal muscle tissue, which allows for voluntary control of arm movements.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.