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Download 30.1 Respiratory and Circulatory Functions Lung diseases reduce
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30.1 Respiratory and Circulatory Functions The respiratory and circulatory systems bring oxygen and nutrients to the cells. 30.1 Respiratory and Circulatory Functions The respiratory system is where gas exchange occurs. – picks up oxygen from inhaled air – expels carbon dioxide and water sinus nose mouth epiglottis trachea lungs 30.1 Respiratory and Circulatory Functions Breathing in driven by the diaphragm and muscles of the rib cage. • Air flows from areas of high pressure to low pressure. Air exhaled. Air inhaled. Muscles contract and rib cage expands. Muscles and rib cage relax. Diaphragm flattens and moves downward. Diaphragm relaxes and rises. 30.1 Respiratory and Circulatory Functions Path of Air (Hair filters dust) (Muscular tube) (voice box with epiglottis (flap)) (long, straight tube in chest cavity) (small tubes) (Tiny air sacs surrounded by capillaries) (Suspended in chest cavity bounded by ribs) Alveoli (Drives breathing) 30.1 Respiratory and Circulatory Functions 30.1 Respiratory and Circulatory Functions Oxygen and carbon dioxide are carried by the blood to and from the alveoli. – oxygen diffuses from alveoli into capillary – oxygen binds to hemoglobin in red blood cells – carbon dioxide diffuses from capillary into alveoli GAS EXCHANGES ALVEOLI capillary alveolus Co2 diffuses into alveolus. co2 o2 capillaries O2 diffuses into blood. 30.1 Respiratory and Circulatory Functions Lung diseases reduce airflow and oxygen absorption. – Asthma constricts airways. – Emphysema destroys alveoli. – Cystic fibrosis produces sticky mucus.
