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Pulse is caused by
(a) the valves in an artery opening and closing
(b) oxygen entering the blood in the lungs
(c) changes in blood pressure in an artery
(d) red blood cells colliding with each other in the arteries
Correct Answer: (a) the valves in an artery opening and closing
Explanation:
Pulse is the heart rate of a person. It is the number of times the heart beats in one minute. Pulse rates vary from person to person. Your pulse is lower when you are at rest and increases when you exercise as more oxygen-rich blood is needed by the body when you exercise.
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. Generally, a lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. For example, a well-trained athlete might have a normal resting heart rate closer to 40 beats per minute.
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