A nurse is explaining the activation of beta2 receptors to nursing students during a clinical rotation at the hospital. Which statement by a student demonstrates a need for further teaching?
“Beta2 activation results in bronchodilation.”
“Beta2 activation results in glycogenolysis.”
“Beta2 activation results in vasodilation of skeletal muscles.”
“Beta2 activation results in contraction of uterine muscle.”
The Correct Answer is D
Choice A Reason:
Beta2 activation results in bronchodilation. This is a well-known effect where the activation of beta2 adrenergic receptors in the smooth muscle of the airways leads to relaxation and widening of the airways, making it easier to breathe. This effect is commonly utilized in the treatment of asthma and other respiratory conditions.
Choice B Reason:
Beta2 activation also results in glycogenolysis. This process involves the breakdown of glycogen into glucose, which increases blood sugar levels. This effect is part of the body’s response to stress, providing additional energy for the “fight or flight” response.
Choice C Reason:
Beta2 activation results in vasodilation of skeletal muscles. This means that the blood vessels supplying the skeletal muscles widen, increasing blood flow to these muscles. This effect helps to deliver more oxygen and nutrients to the muscles during periods of increased activity.
Choice D Reason:
This is the correct answer. Beta2 activation does not result in the contraction of uterine muscle; rather, it causes relaxation of the uterine smooth muscle. This effect is beneficial in preventing premature labor by reducing uterine contractions. Therefore, the statement that beta2 activation results in contraction of uterine muscle is incorrect and indicates a need for further teaching.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A: Hypoventilation
Hypoventilation refers to inadequate ventilation that leads to an increased concentration of carbon dioxide (CO2) in the blood, resulting in respiratory acidosis. This condition is characterized by a decrease in blood pH due to the accumulation of CO2, which forms carbonic acid. Hypoventilation does not cause metabolic acidosis, as it primarily affects the respiratory component of acid-base balance.
Choice B: Massive Blood Transfusion
Massive blood transfusion can lead to metabolic alkalosis rather than metabolic acidosis. This is because stored blood products often contain citrate, which is metabolized to bicarbonate in the liver, increasing the blood’s alkalinity. Additionally, the transfusion of large volumes of blood can dilute the plasma bicarbonate concentration, but this typically does not result in metabolic acidosis.
Choice C: Kidney Failure
Kidney failure is a common cause of metabolic acidosis. The kidneys play a crucial role in maintaining acid-base balance by excreting hydrogen ions (H+) and reabsorbing bicarbonate (HCO3-). When the kidneys fail, they are unable to remove sufficient acids from the blood, leading to an accumulation of metabolic acids and a decrease in blood pH. This condition is known as metabolic acidosis and can result from chronic kidney disease (CKD) or acute kidney injury (AKI).
Choice D: Hyperventilation
Hyperventilation leads to respiratory alkalosis, not metabolic acidosis. This condition occurs when there is excessive ventilation, causing a decrease in CO2 levels in the blood and an increase in blood pH. Hyperventilation reduces the concentration of carbonic acid, leading to an alkaline state. It does not contribute to metabolic acidosis, which involves an imbalance in the metabolic components of acid-base regulation.
Correct Answer is A
Explanation
Choice A Reason:
Necrosis is the term used to describe the death of cells or tissues through injury or disease, particularly when it involves severe cell swelling, breakdown of organelles, and release of cellular debris. This process is typically uncontrolled and results from factors such as lack of blood flow (ischemia), toxins, or trauma. In the context of a heart attack, necrosis occurs due to the lack of oxygen and nutrients, leading to cell death and tissue damage.
Choice B Reason:
Apoptosis is a form of programmed cell death that occurs in a controlled and regulated manner. It is a natural process that helps maintain homeostasis by eliminating damaged or unnecessary cells without causing inflammation. Unlike necrosis, apoptosis involves cell shrinkage, chromatin condensation, and DNA fragmentation, but it does not result in the release of cellular debris.
Choice C Reason:
Adaptation refers to the changes that cells undergo in response to stress or adverse conditions to survive and maintain function. These changes can include hypertrophy, hyperplasia, atrophy, and metaplasia. Adaptation is a reversible process and does not involve cell death or the breakdown of cellular components.
Choice D Reason:
Pathologic calcification is the abnormal deposition of calcium salts in tissues. It can occur in areas of necrosis (dystrophic calcification) or in normal tissues due to hypercalcemia (metastatic calcification). While pathologic calcification can be associated with cell injury and death, it is not the primary process described in the scenario of a heart attack leading to cell death with severe swelling and breakdown of organelles.
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