Certified Emergency Nurse (CEN) Practice Test

Beta one receptors primarily play a critical role in the cardiovascular system. When activated, these receptors lead to an increase in heart rate (positive chronotropic effect) and enhance the force of heart contractions (positive inotropic effect). This response is essential during situations that require increased cardiac output, such as exercise or stress, as the body demands more blood flow to meet the metabolic needs of tissues.

Since beta one receptors are predominantly found in the heart, options related to lung capacity, blood flow to the skin, and digestive processes do not align with the function of these receptors. Lung capacity is influenced by beta two receptors, which target bronchial muscles; blood flow to the skin involves different regulatory mechanisms primarily associated with alpha receptors and not beta one; and digestive processes are regulated by other pathways and receptors, mainly parasympathetic stimulation.

Thus, the focus on heart contractility and rate is precisely why this option correctly answers the question regarding the effect of beta one receptors on the body.