NREMT Paramedic Practice

Which type of medication do Beta 1 blockers primarily affect?

1. Respiratory function

2. Cardiac function

3. Digestive function

4. Nervous system activity

The correct answer is: Cardiac function

Beta 1 blockers primarily affect cardiac function by specifically targeting the beta-1 adrenergic receptors found predominantly in the heart. These medications work by inhibiting the action of norepinephrine and epinephrine on these receptors, leading to a decrease in heart rate and contractility. This action is beneficial in conditions like hypertension, heart failure, and certain types of arrhythmias, as it helps to reduce the workload on the heart and improve overall cardiac efficiency. While options related to respiratory function, digestive function, and nervous system activity may involve other types of beta receptors (like beta-2 for bronchodilation in the lungs), beta-1 blockers are distinct in their primary role of modulating cardiac function. The targeted action of beta 1 blockers makes them integral to cardiac care in various medical situations.