why doesnt your heart get tired?

Question

your heart beats all the time, every day, well, til you die.

1. why doesnt it get fatigued, after all it is a muscle
2. if you are unfit, then do arm excercises, you ache the next day, why is it , that if you suddenly start running alot, you dont get an achey heart

just a friday afternoon brain fart!

Answer 1

Indeed it is amazing that the heart starts beating even before you were born and doesn't stop till you're dead. The reason why the heart has such an endurance and doesn't get sore or tired is because the muscles that the heart is made of is different from the muscles that you use for, say, regular work. The muscles that we normally use for motion such as those in your arms, legs, chest, back, abs, etc. are "skeletal" muscles. While the muscles that make up your heart are "cardiac" muscles.

The "power house" within all types muscle cells the mitochondria, small pockets within the cytoplasm that generate ATP or energy for the muscles to contract and keep working. Through evolution, mitochondria make up only 1% to 2% of the skeletal muscle cell volume. This explains why when we lift weights at the gym, we feel tired after a few repetitions because the few mitochondria in the skeletal muscles have worked "overtime" and cannot produce enough energy for the continuous motion. However, cardiac muscle cells have 30% to 35% in volume of mitochondria, which means there are always sufficient mitochondria to produce energy for every single beat for as long as there's calorie intake. It's like having a lot more power generators as back-up.

Answer 2

I have often wondered that, muscles get tired because they run out of energy, rest and the energy is replaced and they are good to go. Your heart however has a constant supply of energy because it needs to work all the time whereas you muscles only store what they are going to need. The more you exercise the more your muscles store energy so the longer they last without getting tired. If you put a dead frog on an electode it will move the muscle and continue until you run out of electricity, so its not the muscle itself getting tired, its just running out of energy. At least thats my theory

Answer 3

Is it because what makes your muscles fatigued is a build up of latic acid during anerobic respiration. Because the heart is so well supplied with oxygen by many tiny capiilaries and is very close to the lungs prehaps it never has to anerobically respire (is suppose unless your suffocating) and therefore lactic acid is never formed and it does not become fatigued.

Answer 4

Ask for your entrée to be served on a bed of greens rather than a bed of pasta or mashed potatoes.

Answer 5

Walk to some co-worker's desk to chat rather than instant messaging.

Answer 6

I have had my heart hurt bad from exercise. although i am horrendously out of shape. And hearts DO get fatigued. Thats why people that use uppers like coke and ephedra and such have heart failures, heart attacks and all sorts of bad stuff.
And sometimes, when someone tells me they don't love me, my heart hurts. Just like when i make a muscle in my arm, and the ladies dont dig it, my arm hurts cuz its sad.

Answer 7

Get scrubbing up! Give your maid the day off and allow your pad a good clean. You’ll be amazed at how fast you banish those bingo wings.

Answer 8

Wear comfy shoes to help you take meetings for a walk as opposed to sitting at a desk.

Answer 9

although skeletal and cardiac muscle are similar in a lot of approaches, there are major physiological ameliorations that make cardiac muscle a lot less liable to fatigue. because the construct-up of lactic acid performs a serious function in muscle fatigue. Lactic acid is a by technique of-manufactured from an anaerobic type of muscle metabolism (one lacking oxygen). Muscle (in many cases skeletal muscle) starts using the type of metabolism to provide power (interior the variety of ATP) even as the provision of oxygen by ability of the blood flow is in basic terms too low. This in many cases takes position even as muscle is truly energetic. Cardiac muscle has the ease of being provided with oxygen from the blood flow by ability of the coronary artery. This artery is large, and is between the first places oxygenated blood travels to after it leaves heart. hence, the blood provide to cardiac muscle cells is truly wealthy in oxygen, making unnecessary for the heart to change to anaerobic metabolism to provide ATP. yet another major enormous difference between cardiac and skeletal muscle it truly is major in combating cardiac muscle fatigue is the relative type of mitochondria, an organelle major in power production. frequently, cardiac muscle cells have many more effective mitochondria than skeletal muscle cells. because that is mitochondria that produce ATP even as using oxygen (cardio metabolism), cardiac muscle cells are in a position to provide more effective ATP in accordance to cellular, even as oxygen is in good provide, than skeletal muscle cells can.. desire that is an answer on your interesting question.

Answer 10

Intimate, loving, ahem…horizontal physical exercise with your (legal) partner has been proven as one of the most effective ways to transfer those calories. So get into it!