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movement of O2 from lungs to blood, and CO2 from blood to lungs; exchange of gases to outside of the body
movement of blood to tissues, and CO2 from cells to blood; exchange of gases inside the body
Type I cells
flat large squamous cells making up walls of respiratory structures. Supported by their basement membrane. Because it is so thin, diffusion of gases between air and blood can occur
subdivisions of each lobe of the lungs. Each has its own artery and vein, own bronchial supply
brings deoxygenated systemic blood to lungs to get O2. Consists of pulmonary arteries, capillaries in alveoli, and pulmonary veins returned O2 blood to heart
separate set of vessels to nourish the tissue. Bronchiole arteries supplies blood to the lung. Pulmonary veins return the blood given to the lungs by the bronchial arteries.
difference between Intrapleural pressure and intrapulmonary pressure, usually 4mmHg
a collapsed lung. Can be caused by plugged airways, like in pneumonia with mucous plugging the airway.
a disruption in transpulmonary pressure causing a lung collapse. Can occur from chest wound putting higher pressure in the pleural cavity. Treat by closing the wound and using a chest tube to restore pressure.
Dalton's Law of Partial Pressures
total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.
when a mixture of gases is in contact with a liquid, each gas will dissolve in the liquid in proportion to its partial pressure
general term for inadequate O2 delivery to the tissues. When hemoglobin saturation is below 75%, the skin will become cyanotic, particularly under fingernails
type of hypoxia; poor O2 delivery from too few RBCs or abnormal/too little hemoglobin
type of hypoxia; impaired circulation leads to low O2. Can be due to CHF (systemic) or localized (clots)
type of hypoxia; cells are unable to use O2, even though an adequate amount is being delivered. Can occur as a result of poison
results from low partial pressure of oxygen in the arteries. Not enough oxygen is getting in the body, or cells are not picking it up
Carbon Monoxide poisoning
Leading cause of death from fires. Very competitive with O2 for binding to hemoglobin. Doesn't produce typical hypoxia symptoms - no cyanosis or respiratory distress. Instead it presents with confusion, throbbing HA, turns Hb cherry red. Treat by flushing CO out of the system with hyperbaric chambers, O2 therapy.
Ventral Respiratory Group (VRG)
In the medulla; primary rhythm generator for the respiratory system. Contains neurons that fire to control inspiration, and neurons to inhibit those in expiration
Pontine Respiratory Centers
fine tune breathing rhythm, smooth transitions from inspiration is prolonged and pauses, apneustic breathing
increase in rate and depth of breathing. You exceed body's normal need to remove CO2, which will drop. In panic and stress, you get dizzy and feel faint because you are not getting enough blood to the brain, and the brain wants you to lay down to get more blood
too little CO2 in blood. Body's response is to constrict cerebro blood vessels, reducing perfusion (blood flow) to the brain, aka cerebral ischemia. Breathe into a bag to bring CO2 levels back up to restore cerebral perfusion. You could also breathe slowly, hold breath, and exhale
Squamous cell carcinoma
25-30% of all cases of lung cancer, associated with the lining of the bronchi
40% of all cases of lung cancer, most common, originates in peripheral lung areas - outer regions. Develops in bronchial glands of alveoli.
Small cell carcinoma
20% of all cases, originates bear bronchi, grows aggressively. Invades mediastinum, spreading is likely. Surgical removal is the first treatment. If metastasized, use radiation or chemo, survival rate is still poor.
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