Final answer:
The normal resting heart rate for an adult ranges from 60 to 100 beats per minute. Bradycardia occurs when the rate is below 60 bpm and tachycardia when it's above 100 bpm. Maximum heart rates can be up to 200-220 bpm, decreasing with age. The option (C) is correct.
Step-by-step explanation:
The normal circulation rate of an adult should be between 60-100 beats per minute (bpm). This range represents the normal resting heart rate (HR) for adults. A heart rate below 60 bpm is known as bradycardia, and a rate above 100 bpm is referred to as tachycardia. It's important to note that well-trained athletes may have a resting heart rate lower than the standard range, sometimes as low as 30-40 bpm.
However, in most individuals, rates lower than 50 bpm could be indicative of bradycardia, which, depending on the severity, may require medical intervention such as a pacemaker. On the other end of the scale, maximum heart rates can reach up to 200-220 bpm; the maximum heart rate decreases with age and can be estimated with the formula 220 minus the individual's age. Heart health is vital to overall well-being, as the heart pumps thousands of liters of blood throughout the body each day. Therefore, option (C) is correct.