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The partial pressure of oxygen in arterial blood is approximately
Spinalis Cervicis
A neck muscle that is part of the spinalis muscle group, responsible for extending and stabilizing the cervical spine.
External Anal Sphincter
A muscle that surrounds the anus, controlling the expulsion of feces from the body.
Levator Ani Iliococcygeus
A component of the levator ani muscle, which supports the pelvic organs and helps in maintaining fecal continence.
External Urethral Sphincter
A circular muscle that controls urination by constricting or relaxing to allow the flow of urine from the bladder.
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