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Although theories have tended to change over time, for quite some long time now, the most standard answer has been, "lactic acid", although newer explanations have been proposed

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Q: What build up in the body causes stiff muscles?
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What is rigor mortis-?

Rigor mortis is a build up of released lactic acid. Rigor mortis starts a few hours after you die, and causes your muscles to contract, or shorten, which is their natural state. After about 12 hours Rigor mortis begins to dissipate.


What is the state of the body after death in which the muscles become stiff called?

rigor mortis


What usually causes joint pains?

Joint pains can be caused by starting a new workout routine. If your body is not used to exercising a lot and then you start and exercise program, you joints and muscles may become stiff and sore.


Why does an alhlete need protein?

protein is neede for the body to build muscles, and muscles are important to athletes.


How can you build muscles up on your upperbody?

To build muscles on your upper body,you have to keep lifting weight and press up for at least four times in a week


Do potatoes help build muscles?

Yes, potatoes provide your body with the carbs it needs to fuel your muscles.


How much carbohydrates does the body need to build muscles?

As much as Protein.


Why is it important for your body to get protein?

because protein is important to build muscles


How can you add muscles on body?

You cannot add muscles to your body, however you can build the ones you already have by eating the correct amount of proteins and exercising daily.


What is the interaction of muscles witt the skeleton that causes body movement?

Locomotion


When you work out do you gain weight because you build muscle?

When you do your work out , you do not gain weight , your body uses it to build muscles.


Why is beef important to the body?

It contains protein, which helps build up muscles