MCQ Detailed View

The heartbeat is the rhythmic contraction and relaxation of the heart muscles, which pumps blood throughout the human body. The number of heartbeats per minute is known as the pulse rate or heart rate. In a healthy adult man at rest, the average heartbeat is around 70 beats per minute (bpm).The human heart is a muscular organ that maintains the circulation of blood, supplying oxygen and nutrients to tissues while removing carbon dioxide and waste products. The heart rate can vary based on age, activity level, fitness, emotions, and overall health, but in a calm and resting state, it usually falls within the range of 60 to 100 beats per minute. Among this range, 70 bpm is often considered the standard average for a normal, healthy adult.

Here is a comparison of the given options:

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  50 bpm: This is lower than normal and typically seen in athletes or individuals with bradycardia (slow heart rate).

  
  


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  70 bpm: This is the average and most commonly observed resting heart rate for adults.

  
  


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  80 bpm: This is slightly higher than average but still within the normal range.

  
  


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  100 bpm: This is the upper limit of normal resting heart rate. Consistently having 100 bpm or above at rest may indicate tachycardia (fast heartbeat).

  
  

The heart rate is regulated by the sinoatrial (SA) node, also called the heart’s natural pacemaker. It responds to signals from the nervous system and hormones to speed up or slow down the heartbeat based on the body's needs, such as during exercise or sleep.

In conclusion, the correct answer is 70 beats per minute, which represents the average resting heart rate in a normal adult man under healthy conditions.