Biofeedback Certification International Alliance (BCIA) Certification Practice Exam

The release of epinephrine and norepinephrine, commonly associated with the body's "fight or flight" response, leads to significant physiological changes that prepare the body for immediate action. One of the key effects of these hormones is the increase in cardiac output and blood pressure.

When epinephrine and norepinephrine are released into the bloodstream, they stimulate the heart to beat faster and with greater force, which increases the volume of blood being pumped. This directly results in a rise in cardiac output. At the same time, these hormones promote vasoconstriction of certain blood vessels, which helps to elevate blood pressure. The combined effect of enhanced cardiac output and increased peripheral resistance due to vasoconstriction ensures that more oxygen and nutrients are delivered to vital organs and muscles, preparing the body for heightened physical activity or stress responses.

The other choices present effects that do not align with the action of epinephrine and norepinephrine. For instance, dilating peripheral arteries may occur, but it generally pertains to specific contexts rather than the overall response associated with these hormones. Decreasing respiratory rate and reducing metabolic rate are contrary to the functions of epinephrine and norepinephrine, which typically stimulate increase in both respiration and metabolism to meet the body’s