1. overworked to an extent
2. run out of carbs
3. not knowing your body's limits
All muscles cause movement due to the contraction of coupled muscle cells. Perhaps the question intended to inquire about muscles that cause a bending in which the joint angle decreases. Muscles of this type are called flexor muscles (biceps for example).
Muscles work by contracting not extending. Thus the mechanics of a body powered by muscles needs to work with that property. Muscle groups are therefore paired, on to pull a lever one way on one side of the hinge and another to pull the other way on the other side.
atrophy is a decrease in muscle mass. Hypertrophy is muscle growth.
The skeletal muscle is the only type of muscle which is voluntary.
The dilator muscle which makes the pupil larger and the constrictor muscle which makes the pupil smaller.
Being sunburned can cause fatigue, but does not usually cause muscle aches specifically.
arector pili muscle
The sternocleidomastoid muscles are the ones that flex when the intercostals are flexed. This will also cause the scalene muscles to flex.
Depends. At first, muscle exerice tends to promote muscle development, and muscles have weight to them. But more muscles means you can burn more calories when exercising, and more burn can help with weight loss.
Yes, exercising the core muscles for 2 hours each day of the week is extremely unhealthy. The core muscles, just like every muscle group, must have adequate time to heal and repair. Exercising muscle groups more than twice a week is over-training and may cause serious problems.
Contraction of the pupillary contrictor muscles.
Involuntary muscle movement includes peristalsis in the GI tract and the beating of your heart. Generally involuntary muscles are smooth muscles (intestines, blood vessels), but the cardiac muscles are sometimes categorized as striated due to their structural similarities to skeletal muscles.