Category: L
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Left pulmonary arteries
Vessels that transport blood from the heart to the lungs.
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Left lung
Structure of respiration located in the left chest, comprised of the superior, middle, and inferior lobes.
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Latissimus dorsi muscle
Muscle that extends and abducts the upper arm. A large triangular muscle of the back originating on the lower six thoracic and the lumbar vertebrae, the lower four ribs, the sacrum, and the iliac crest and inserted in the intertubercular groove of the humerus. It adducts, extends, and medially rotates the arm and is controlled…
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Lateral rectus muscle
Muscle that turns the eye away from the midline of the visual field.
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Laser thermal keratoplasty
Treatment of refractive errors of the eye by heating the cornea to shrink the collagen fibers, reshape the eye, and change the angle of the cornea in relation to the focal point.
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Laryngotracheotomy
Surgical removal of the larynx and upper tracheal rings, often due to advanced malignancy. A surgical procedure where an artificial airway is created by making an incision through the cartilage rings of the upper trachea and inserting a metal tube, allowing the patient to breathe through this tube rather than the mouth.
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Lactic dehydrogenase test
A laboratory blood test to determine the quantity of enzymes related to muscle destruction.
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Lactation amenorrhea
Suppression of menses while nursing.
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Lysinemia
Inborn error of metabolism in which a defect in or lack of enzymes leads to inability to metabolize the amino acid lysine; it is characterized by muscle weakness and mental retardation. Treatment is by limiting the intake of lysine in the diet.
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Lysine intolerance
Disorder in which a lack of or defect in certain enzymes produces inability to utilize the amino acid lysine, resulting in weakness, vomiting, and coma. Treatment is by limiting lysine content in the diet.