Certified Cardiac Rehabilitation Professional (CCRP) Practice Test 2026 – Complete All-in-One Guide for Exam Success!

Sympathetic nervous system (SNS) activation plays a crucial role in preparing the body for 'fight or flight' situations, which includes a significant increase in heart activity. When the sympathetic system is activated, it releases neurotransmitters such as norepinephrine, which bind to beta-adrenergic receptors in the heart. This binding increases both the heart rate (a phenomenon known as positive chronotropic effect) and the force of contraction of the heart muscle (known as positive inotropic effect).

As a result, the heart pumps more blood to the muscles and vital organs, providing the necessary oxygen and nutrients required during times of physical stress or emergency. This increase in heart rate and contraction force is essential for sustaining elevated levels of blood flow and ensuring that the body's energy demands are met effectively. Therefore, the correct choice reflects the physiological response of the heart under the influence of sympathetic activation.