Which of the following describes the action of an agonist on a receptor.

Correct Answer: C

Rationale: An agonist is a substance that binds to a receptor and activates it, leading to a biological response. Agonists mimic the action of endogenous ligands that normally bind to the receptor, resulting in activation of downstream signaling pathways. This activation can lead to various physiological effects depending on the specific receptor and pathway involved. In contrast, antagonists block or inhibit the actions of agonists by binding to the receptor without activating it, therefore not producing a response. Therefore, the correct answer is that an agonist activates a receptor.

Correct Answer: C

Rationale: Nitroglycerin is an antianginal medication that belongs to the class of nitrates. It is used to relieve chest pain or angina by dilating blood vessels, which reduces the workload of the heart and improves blood flow to the heart muscle. Nitroglycerin helps to relax and widen blood vessels, increasing the supply of oxygen and blood to the heart. It is often used for the treatment and prevention of angina attacks. In contrast, options A, B, and D are not antianginal medications or nitrates.

Correct Answer: C

Rationale: Paradoxical bronchospasm is a major side effect of Albuterol, which is a medication commonly used to treat bronchospasm in conditions such as asthma and chronic obstructive pulmonary disease (COPD). It is characterized by a sudden worsening of breathing difficulty after using the medication, rather than an improvement. This adverse reaction can be serious and requires immediate medical attention. It is crucial for healthcare providers to monitor patients for this side effect when using Albuterol to ensure proper management and prevent complications.

Correct Answer: D

Rationale: Supplements are drugs that can be used to provide the body with essential nutrients that may be lacking. They are designed to complement the diet and help fulfill specific nutritional needs, such as vitamins, minerals, amino acids, or other substances. Unlike stimulants, depressants, or irritants that affect the central nervous system in various ways, supplements aim to provide a beneficial addition to the body's existing resources. Prophylactics, on the other hand, are preventive methods or medications used to protect against diseases or health issues, rather than addressing existing deficiencies like supplements.

Correct Answer: C

Rationale: Pain is described as an unpleasant sensory and emotional experience associated with actual or potential tissue damage. It serves as a protective mechanism to alert the body of potential harm and encourage appropriate action to avoid further injury. Pain can be acute or chronic, and it can vary in intensity and duration depending on the underlying cause. In contrast, the other options do not directly correspond to the described sensation of pain associated with tissue damage.