Why does bronchospasm occur during an asthma attack?

💡 Explanation

Bronchospasm happens because mast cells degranulate, releasing histamine and leukotrienes that cause bronchial smooth muscle constriction and inflammation. Therefore, option B is correct, rather than A where epinephrine causes relaxation, C involves acetylcholine release, and D is incorrect since albuterol activates beta-2 receptors.

• Why does increased cerebral blood flow immediately after a concussion paradoxically exacerbate neuronal damage, despite appearing beneficial?
• A patient with Hashimoto's thyroiditis takes levothyroxine (synthetic T4). Which feedback mechanism impairment most likely reduces the drug's effectiveness in restoring normal T3 levels in peripheral tissues?
• Why does carbohydrate fermentation in the colon yield short-chain fatty acids, rather than monosaccharides, despite amylase-mediated digestive breakdown?
• Why does severe insulin resistance often coincide with elevated triglyceride levels in patients with metabolic syndrome?
• Why does reading small print tire the eyes faster in a 50-year-old compared to a 20-year-old?
• If neuronal autophagy declines in a patient with developing Alzheimer's disease, which consequence follows regarding neurodegenerative pathology?