Which term describes the heart's rate of beating faster?

The term that describes the heart's rate of beating faster is "chronotropic." This term specifically refers to any influence that affects the heart rate. Factors influencing heart rate can include various physiological changes, hormonal influences, and external stressors. For example, sympathetic activation during stress can lead to an increased heart rate (tachycardia), which is a direct application of chronotropic effects.

In contrast, "inotropic" relates to the force of contraction of the heart muscle, while "dromotropic" pertains to the conduction speed of electrical impulses through the heart, such as through the AV node. Depolarization refers to the process by which cardiac muscle cells undergo electrical changes leading to contraction, but it does not specifically describe an increase in heart rate. Therefore, "chronotropic" is the most accurate term for indicating an increase in the heart rate.