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Why is his or hers bigger than mine?

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    Zachary B.
    Zachary B.

    Why are his muscles bigger than mine?W

    Rk S.
    Rk S.

    Why is his or hers bigger than mine? To rephrase, we might start by asking, "What are the determinants of VO2 max?" Every cell consumes oxygen in order to convert food energy to useable ATP for cellular work. Muscle cells that are contracting have high demands for ATP. So it follows that they will consume more oxygen during exercise. The sum total of billions of cells throughout the body consuming oxygen and generating carbon dioxide can be measured as the breath, using a combination of volume-measuring and oxygen-sensing equipment. So if we measure a greater consumption of oxygen during exercise, we know that more muscle cells are contracting and consuming oxygen. To receive this oxygen and use it to make ATP for muscle contraction, our muscle fibres are absolutely dependent on two things: an external delivery system to bring oxygen from the atmosphere to the working muscle cells mitochondria to carry out the process of aerobic energy transfer Endurance athletes are characterised by both a very good cardiovascular system and well-developed oxidative capacity in their skeletal muscles. We need a big and efficient pump to deliver oxygen-rich blood to the muscles, and we need mitochondria-rich muscles to use the oxygen and support high rates of exercise. Which variable is the limiting factor in VO2 max. - oxygen delivery or oxygen utilisation? This is a question that has created debate among exercise physiologists, but, for most, the jury is still out.

    Muhammad S.
    Muhammad S.

    Muscles are expand and decrease during practice.

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