Which type of laxative causes peristalsis by irritating the bowel?
Stool softener
Saline/osmotic laxative
Stimulant laxative
Bulk-forming laxative
The Correct Answer is C
A) Stool softener:
Stool softeners, such as docusate sodium, work by adding moisture to the stool, making it softer and easier to pass. They do not directly stimulate bowel movements or peristalsis through irritation of the bowel lining.
B) Saline/osmotic laxative:
Saline or osmotic laxatives, such as magnesium hydroxide (milk of magnesia) and polyethylene glycol (PEG), work by drawing water into the intestines, which softens the stool and increases bowel motility. They do not primarily act by irritating the bowel lining.
C) Stimulant laxative.
Stimulant laxatives work by directly stimulating the nerves in the intestines, which increases the rhythmic contractions of the intestines (peristalsis) and promotes bowel movements. These medications irritate the bowel lining, leading to increased motility and expulsion of stool. Examples of stimulant laxatives include bisacodyl and senna.
D) Bulk-forming laxative:
Bulk-forming laxatives, such as psyllium and methylcellulose, work by increasing the bulk and water content of the stool, which stimulates bowel movements. They do not directly irritate the bowel lining to promote peristalsis. Instead, they absorb water and swell in the intestines, creating a larger, softer stool that is easier to pass.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A) Theophylline:
Theophylline is a bronchodilator medication that is used for the long-term management of asthma and chronic obstructive pulmonary disease (COPD). It has a slower onset of action compared to short-acting beta-agonists like albuterol and is not typically used as the initial treatment for acute asthma exacerbations.
B) Montelukast:
Montelukast is a leukotriene receptor antagonist used for the long-term control and prevention of asthma symptoms, but it is not typically used as the initial treatment for acute asthma exacerbations. Its onset of action is slower compared to short-acting beta-agonists like albuterol.
C) Albuterol.
Albuterol is a short-acting beta agonist bronchodilator commonly used as a first-line treatment for acute asthma exacerbations. It works by quickly relaxing the smooth muscles of the airways, leading to rapid bronchodilation and improvement of airflow. This can help alleviate the patient's symptoms of shortness of breath and wheezing.
D) Salmeterol:
Salmeterol is a long-acting beta-agonist bronchodilator used for the maintenance treatment of asthma and COPD, but it is not typically used as the initial treatment for acute asthma exacerbations. Its onset of action is slower compared to short-acting beta-agonists like albuterol, and it is not recommended for rapid relief of acute symptoms.
Correct Answer is C
Explanation
A) Lowered heart rate:
Dopamine typically increases heart rate as it acts on beta-adrenergic receptors in the heart, leading to increased cardiac contractility and chronotropy. However, at low doses, the effect on heart rate may be minimal compared to higher doses.
B) Decreased conduction through the AV node:
Dopamine may have minimal effects on conduction through the atrioventricular (AV) node, especially at low doses. It primarily acts on adrenergic receptors to increase cardiac contractility and heart rate.
C) Increased urine output.
Dopamine is a medication commonly used to treat shock by improving cardiac output and blood pressure. At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. This increased renal blood flow leads to increased glomerular filtration rate (GFR) and urine output. Therefore, increased urine output is an expected effect of dopamine infusion at low doses in the treatment of shock.
D) Vasoconstriction of renal blood vessels:
At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. Vasoconstriction of renal blood vessels is more commonly associated with higher doses of dopamine or with other vasopressor medications such as norepinephrine or phenylephrine.
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