It could be just a muscle strain, or maybe a torn ligament, but I would think you pulled a muscle, not that bad
You could have strained the connective tissue between the muscles.
Muscular endurance us the term phrase used for working muscles hard for long periods of time without getting tired. The more the muscles are worked, the stronger they become and the more they can take.
Without getting into it. The heart is just a muscle and muscles can't work without oxygen.
You lose fat on your legs without getting bulky muscles by doing cardio - instead of weight lifting - and reducing your carb and calorie intake by 30% on a daily basis. There is no other way, no such thing as a 'spot treatment' for your legs.
It isn't just muscles, but the interaction between muscles, ligaments, tendons, nerves, and the bones that permit movement. In muscles only, it's contraction and relaxation, but without the rest involved, the muscles would not result in purposeful movements.
Involuntary muscles are those that move without conscious control.
cardiac muscles
Involuntary muscles
Involuntary muscles.
Involuntary muscles move without conscious effort - the heart, for example.
The heart muscle is designed to work continuously without getting tired. This is because it has a rich blood supply and is made of endurance muscle fibers that allow it to contract and relax rhythmically without fatiguing.
You can live without a lot of muscles, you just won't be comfortable. You can live without leg muscles, or feet muscles, you just won't be able to walk. You can live without hand or arm muscles, you just won't be able to hold things or interact with things with your hands. You can live without facial muscles, you just won't be able to express your feelings with your face, and may have problems chewing your food, or holding your food inside your mouth.