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Published byBenedict Woods Modified over 8 years ago
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The Respiratory System
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Respiratory system: moves oxygen into the body & removes carbon dioxide produced as wastes.
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Respiration… Chemical process that uses oxygen to release energy from food.
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Breathing… process of moving air into & out of the body.
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Diaphragm… large muscle at the base of the lungs that contracts & relaxes with the rib muscles causing you inhale & exhale.
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Nose (mouth) Pharynx Bronchus Path of air to lungs… Trachea Bronchial tubes Bronchioles Alveoli
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Nose Mouth
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Mucus… traps dust & bacteria… moistens air to keep nasal tissues from drying out.
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Cilia… tiny hair like structures that line the nasal cavities & clean air by sweeping mucus, dust & bacteria to be swallowed & destroyed by the stomach acid.
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Pharynx… area of the throat shared with the digestive system where air passes to lungs from nose/ mouth.
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Trachea… tube lined with cilia, mucus & rings of cartilage that keep it open so air can pass to the lungs.
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...sealed shut when you swallow by the to keep food from entering. epiglottis
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Larynx… located at the top of the trachea… “vocal chords” vibrate as air pass through to make your voice.
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Bronchus & bronchial tubes… tubes that branch to move air from the trachea into each lung.
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Alveoli… tiny, hollow air sacs in the lungs surrounded by blood vessels for gases to move in & out of the blood.
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Gas exchange: oxygen diffuses through the wall of the alveoli then through the wall of the capillaries to get into the blood…
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…at the same time, carbon dioxide diffuses from the blood into the alveoli to be exhaled.
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Asthma… Inflammation or narrowing of the airways that can cause wheezing, shortness of breath, chest tightening or coughing.
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Bronchitis… The inflammation of the airways of the lungs producing a cough with mucus production.
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Pneumonia… The inflammation of the lungs where air sacs fill with liquid or pus… caused by bacteria, viruses or chemical irritants.
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Emphysema… Damage the air sacs in the lungs affecting their ability to exchange gases and get enough oxygen into the blood… caused mainly by smoking.
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Lung cancer… Growth of tumor(s) in the lung tissue.
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