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When you exercise you use your muscles and your muscles contain Glycogen which could be considered your "energy source". during exercise your muscles use glycogen depleting your energy levels making you feel tired.

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Q: Why do muscles need more energy when you exercise?
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Related questions

Why does or muscles need more blood during exercise?

When you exercise, you need to move a lot, so you'll need more blood to carry oxygen and do gas exchange to transfer energy.


How does exercise Increased number of mitochondria?

Mitochondria make the energy in your body. During exercise you need more energy so you need more energy "factories"


What does the heart do when you exercise?

Your heart beats faster and you breathe more because your blood cells need more energy to give to your muscles


What does it mean when your muscles dilate?

During exercise your muscles need more energy from respiration in order to contract. So your heart beats faster and the arteries supplying the muscles dilate (widen)


Why does the heart beat faster when exerciseing?

As you exercise, the muscles need more oxygen to work. The heart beats faster to get the oxygenated blood from the lungs to the muscles. The harder you exercise, the more oxygen the muscles need, the faster the heart beats.


Name the gas your muscles need more of during exercise?

Oxygen


Why muscles have more mitochondria?

Muscles are metabolically very active.So they need lot of energy.


Does exercise get your blood flowing?

Yes, your muscles need more blood pumping to them when they are getting


Why do you breath very quickly after exercise?

Because when you work your muscles they need more oxygen, and to get more oxygen you need to breathe more often.


What has more mitochondria your muscle or your bones?

muscles. The cells need to produce more energy


When you excerise why do you breathe heavy?

In order to operate our muscles, we need a substance called Adenosine Triphosphate (ATP). This provides the energy that our muscles need to contract and give us movement. In order to create ATP, our body needs a substantial amount of oxygen supplied via our blood to the cells. When we exercise, our muscles become overactive and require more and more ATP to function. As a result, our muscles need more oxygen, so we must breathe more (and usually faster) to supply them.


Why does blood pressure increase during exercise?

As we exercise, we use our muscles. Our muscles need oxygen to function. Therefore, the more we exercise, or the harder we exercise, the more oxygen we need. In order for our muscles to get that extra oxygen, we need to breathe more. The oxygen then enters our blood and our hearts beat stronger and faster in order for the oxygen to reach the muscles as quickly as possible, thus why our blood pressure increases.