Mucles get tired because you get a lot of work out like if your going to the gym or if you are playing a sport.
The first picture shows a person or people working out in a gym.
The second picture shows two soccer players playing in a soccer game.
How fast muscles get tired vary from person to person. It will vary based on the persons activity level, how hydrated they are, as well as how much muscle mass they have compared to others. While some peoples muscles won't get tired too quickly, others who aren't very active may get tired quickly.
Because muscles have such a hard task. The only muscle in your body that does not get tired is your cardiac muscle also known as your HEART
The heart
YOUR BRAIN REACTION,YOUR muscles, tired or no tired,even weather.
Both fast oxidative and fast glycolytic muscle fibers are types of fast-twitch muscle fibers that contract quickly and generate a lot of force.
When a muscle is exercised, lactic acid is formed in the muscle, and that is what makes the muscle feel tired. With a short rest, the lactic acid is carried away by the blood stream and the tired feeling goes away.
Pretty fast
The human body is composed of muscles (and all else). When you use those muscles they need oxygen. Playing "soccer" raises the muscle usage. Alas, you get tired!
Heart problems muscle weakness tired confusrd
Plz
when you get tierd
is it true your cardiac muscle tires