The heart rate in an adult person is A)50-60 times per minute B)70-80 times per hour C)70-80 times per second D)70-80 times per minute
Option D) Heart rate refers to the speed of the heartbeat, specifically the number of heartbeats per unit of time. The heart rate is typically expressed as beats per minute (bpm). The normal human heart rate ranges from 60–100 bpm; however 70-80 bpm is treated as the normal in adults.
