NAUI Master Scuba Diver 146 Diving Physiology Abnormal loss of water from your body that you do not replace. Di aphragm- Muscular partition separating your abdomen and thorax that you contract in order to inhale. Di sorientation- Loss of your sense of direction or position. Di uresis- Formation of urine, commonly used to mean excessive or unusually large volumes. Di ve reflex- Combined effects of immersion which result in decreased heart rate and reduced blood circulation to your limbs. Dr owning- Death within 24 hours of suffocation by submersion. Ea r Drum- Also called tympanic membrane. Thin, semitransparent, oval membrane between your middle ear and external ear. Ep iglottis- Flap of cartilage that sits over your glottis to prevent things from getting into your windpipe (trachea). Es ophagus- Muscular, membranous tube carrying food from your throat to your stomach. Eu stachian Tube- Tube connecting your middle ear and throat, which drains and ventilates your middle ear. Ex piratory Reserve- Volume of air that you can forcefully breathe out after a normal breath. Ex ternal Ear- The part of your ear that you can see and stick your finger into. Fr enzel Equalization Maneuver- Ear equalization technique done by sealing your nose and mouth, contracting various muscles in your mouth to open your Eustachian tubes, and using your tongue as a piston to push air up our Eustachian tubes. Gl ottis- Your vocal cords, ligaments, and muscles, and the opening between them. He at Cramps- Cramps that occur during exertion in the heat. He at Exhaustion- Also called heat prostration. Weakness and collapse from overheating and depletion of body fluids. He at Rash- Also called prickly heat. Inflammatory skin eruptions in your sweat pores. He at Stroke- Serious heat injury following failure of your body’s temperature-regulating systems. He moglobin- Iron-containing molecule in your red blood cells that carries oxygen and carbon dioxide. Consists of about 6 percent heme and 94 percent globin. Hyperthermia- Abnormally high body core temperature. Hy percapnia- Increased carbon dioxide in your blood. Hy pocapnia- Decreased carbon dioxide in your blood. Hypothermia- Body core temperature below 95°F. Hy poventilation- Abnormally slow and shallow respiration, allowing carbon dioxide to increase in your blood In ner Ear- Also called the labyrinth. Deepest portion of your ear. Involved in both hearing and balance. Includes the semicircular canals, vestibule, and cochlea. In ner Ear Bends- Decompression sickness of your inner ear, more common when switching gases on ascent during deep and technical dives. Also called vestibular bends and “staggers,” because vestibular damage can produce a whirling sensation, making you unsteady. In spiratory Reserve- Volume of air that you can breathe in after a normal breath. La rynx (pronounced LAR’ inks)- Also called voice box. Chamber on your trachea, made of cartilage and muscle, that contains your vocal cords. Li mb Bends- Decompression sickness manifesting as joint pain. Lu ngs- Either of two soft, spongy, cone-shaped respiratory organs in your chest that supply your blood with oxygen, remove carbon dioxide, produce various chemicals, and filter particles. Your right lung has three lobes. Your left has two to make room for your heart. Me diastinal Emphysema- Gas in the space in your chest between your lungs and sternum, called the mediastinum.
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