What is erector muscle?
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Erector (Latin = erigere ) muscle is a muscle that raises a part, such as the Erector pili; this is responsible for raising hairs on your arms and such. Often referred to as "goose bumps."
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Our bodies actually have three types of muscles - skeletal, smooth and cardiac.\n\nIf you looked at muscle tissue closely, it is a lot like a system of telephone cables in bundles or fibres: each bundle contains smaller bundles of cables, each of which contain still smaller bundles.\n\nHave a look at your upper arm, and particularly at your bicep. When your arm is straight, your bicep is long. Now bend your arm towards your body. The bicep gets much shorter – it contracts. You should actually see the muscle fibres go from being long and thin to being shorter and fatter. But how do the muscles return to their original length?\n\nHere ares some websites that explain what a muscle does for grade school readers:
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Muscle mechanics\nThe gluteus maximus, the large muscle in your buttocks, works together with the two muscles on your outer hip, called your hip abductors. The hip abductors are the gluteus medius and gluteus minimus. Attached to your pelvis and the top of your thighbone, the gluteus medius - with the assistance of your gluteus minimus, located under it - moves your leg out, away from the center of your body.
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a muscler tes bras et surtout tes pectoraux
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It comes from the muscle having a spasm.
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The third class (see link for illustration).  The articulation is at one end, the resistance at the other, and the muscle is between, evidently close to the articulation.
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There is muscle called spincter muscle which bears the load for certain time but when it becomes loose u are not in control of the sensation and this is the possible reaction u expect
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That is the diaphragm. It is a muscle that helps breathing.
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The Latissimus Dorsi is a muscle in the back.  It a large, broad muscle that brings the arm down and back.\n\nReaching up to get something is one example how you use it every day.  Also, swimming, golfing, throwing things, tennis.
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The PC muscle is the muscle that you use to stop your urine flow. It is also the same muscle you would use to tighten your butt hole. You can strenghten this muscle by working it daily by flexing it about 20 times in sets of 3 or 4 if you want. Also, you can add waight by raising a wet towl with your erect penis about 10 times in sets of 4. By strenghtening this muscle, you will gain better control of your orgasms, thus delaying your orgasms till you want to have one.
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In anatomy, Flexion is movement whereby bones or other objects are brought closer together. For example, flexion of the arm involves the forearm being brought closer to the arm. Note that flexion only occurs along the sagittal plane, i.e. from the forward to backward direction, and not side-to-side direction, which would be called abduction.
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a muscle fiber found near the heart.\n\nA cylindrical multinucleated cell composed of myofibrils that contract when stimulated.
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Muscle fibers become torn after an intense exercise. They then need time to repair the damage, and prepare for another round of intense exercise by making a little bit more muscle. As a bodybuilder, I will not exercise my muscles till they are not sore, and I know that my muscle fibers are repaired and prepared for another round of even heavier weights! So, I would hold off a few days till they feel not sore (sore means that the cells that you broke in your muscle fibers have not been cleaned up by the body and are causing inflammation at the sight. This is so the blood can keep coming in and cleaning up the broken cells as your body repairs them).
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released from muscle stores as a form of energy
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Its called the gastrocnemious.\n\nEver wonder why biceps and triceps are "bi's and tri's," pectorals are "pecs," your gluteus maximus are "glutes" -- but no one ever calls the calf muscle "gasses"?
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"A motor unit is a single motor neuron and the corresponding muscle fibers it innervates; groups of motor units work together, as a single muscle. The number of muscle fibers within each unit can vary: thigh muscles can have a thousand fibers in each unit, eye muscles might have ten. In general, the number of muscle fibers innervated by a motor unit is a function of a muscle's need for refined motion." - Wikipedia\n\nIn other words, the more fibers per motor unit, the stonger the muscle will be (for a given number of motor neurons, and as a general guide), and the less fine motor control it will have.
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A muscle spasm is a muscle that tightens up and hurts until it is released by rubbing. What causes it, is either lack of Vitamins in the body and or tension in the tendons.