Question

Statement A: Antihistamines are used to treat motion sickness Statement B: Histamine increases gastrointestinal motility

A) Both A and B are true statements, and B is the correct explanation of A.
B) Both A and B are true statements, but B is not the correct explanation of A.
C) Statement A is true, and Statement B is false.
D) Statement A is false, and Statement B is true.

Answer 1

Antihistamines are used to treat motion sickness, but histamine does not increase gastrointestinal motility.

Step-by-step explanation:

Statement A is true: antihistamines are used to treat motion sickness. Antihistamines, such as dimenhydrinate (Dramamine®), can be used to alleviate symptoms of motion sickness, including nausea and dizziness. They work by blocking the action of histamine, a chemical that triggers allergic reactions and is also involved in the regulation of the vestibular system in the inner ear.

Statement B is false: histamine does not increase gastrointestinal motility. Histamine actually decreases gastrointestinal motility and can lead to symptoms of diarrhea. Antihistamines that target the histamine H2 receptor, such as ranitidine, are used to treat gastric acid conditions like peptic ulcers and acid reflux.