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	Biology why cardiac muscles never get fatique?
	1 Answers Asked By naveen

	Hey, Naveen. The cardiac muscle is not as prone to fatigue as skeletal muscles for several reasons. Fatigue happens when a muscle switches to anaerobic respiration because the blood oxygen level is too low. This type of metabolism creates lactic acid which is what causes fatigue. The heart does not face this issue because its oxygen comes from the coronary artery. This is a large artery and one of the first places oxygen rich blood goes to so it has a high oxygen content so the heart will never need to switch to anaerobic respiration. The second reason pertains to the concentration of mitochondria in the cells. Since the cardiac muscle has more mitochondria per cell than skeletal muscles, each cardiac muscle cell can produce more ATP thus reducing the level of fatigue it experiences. Hope this helps. Answered By Peter

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