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FACT: Slow twitch (Type I) muscle contain proteins that give it a rich red color. This muscle carries more oxygen efficiently and using fats, proteins or carbs as energy slow twitch muscle fibers contract over a long period of time.

Human Reproductive System Female Female Reproductive System The Free Encyclopedia

A human cardiovascular beats about 45 zillion times annually, but this may vary based on factors like age, male or female and workout level. According to the American Cardiovascular Association, a typical heart rate can range between 55 and one hundred beats per minute. However , the resting pulse rate under 85 beats per minute is considered optimal. Your heartrate has large variability and will change generally throughout the day. Here are six main factors in which influence pulse rate.

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