The Ulnaris and the Urethrae muscle
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One muscle that starts with the letter "U" is the Ulnaris muscle, also known as the Extensor carpi ulnaris. It is located in the forearm and is responsible for wrist extension and adduction.
The muscle that starts with the letter "o" is the orbicularis oris, which is a circular muscle surrounding the mouth. It is responsible for controlling lip movements and aiding in actions such as puckering, kissing, and smiling.
The trapezius muscle, commonly known as the traps, is a large muscle in the upper back and neck region. It is responsible for movements like shrugging the shoulders and pulling the shoulder blades together.
Muscle spindles primarily monitor muscle length and changes in muscle length, providing information about muscle stretch and contraction. Tendon organs, on the other hand, monitor muscle tension or the force of muscle contraction by detecting changes in tension within the tendons. Together, these sensory receptors help regulate muscle tone and protect muscles from injury.
Skeletal muscle contains cylindrical cells with branching ends. These cells are called muscle fibers and are responsible for voluntary movements in the body. Skeletal muscle is attached to bones by tendons and is striated in appearance.
The process that causes muscle tiredness can be reversed because once the muscle starts getting the right products it needs it can start its normal process. This is why when the muscle gets more oxygen it stops cramping.