11.3 RESPIRATORY SYSTEM DISORDERS
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1 11.3 RESPIRATORY SYSTEM DISORDERS
2 TONSILLITIS Infection of the tonsils Bacterial or viral Symptoms: red and swollen tonsils, sore throat, fever, swollen glands Treatment: surgically removed Tonsils: in the pharynx, back of throat, keep bacteria/harmful substances out of respiratory system
3 LARYNGITIS Inflammation of larynx Causes: infection or overstraining the voice Clears up after a few days
4 PNEUMONIA Inflammation and fluid build-up in alveoli Bacterial or viral Types: lobular and bronchial Treatment: antibiotics (bacterial), anti-virals, vaccines Lobular pneumonia involves only a single lobe of the lungs, and is most often caused by a bacterial infection. Bronchial pneumonia affects patches of both lungs in the areas around the bronchi or bronchioles.
5 BRONCHITIS Inflammation, redness, extra mucus in membranes of bronchi Mucus expelled by coughing short term: caused by a bacteria long term (chronic): caused by regular exposure to concentrations of dust, chemical compounds, or cigarette smoke destroy the cilia
6 BRONCHITIS chronic bronchitis: aka COPD (chronic obstructive pulmonary disease) and leads to infection, persistent cough, and build-up of mucus treatment (not cure): medications, quit smoking, special exercise programs
7 ASTHMA Inflammation of bronchi and chronchioles Trigger: pollen, dust, smoke narrows air passages, reduces airflow symptoms: wheezing, coughing, tightness in the chest, shortness of breath cannot be cured but can be managed treatments: inhalers and muscle-relaxing medications Video (2:28)
8 EMPHYSEMA Alveolus walls lose elasticity Reduces respiratory respiratory surface for gas exchange breathing is laboured due to collapsed bronchioles a class of COPD that is incurable symptoms can be treated with inhalers or low-flow oxygen tanks causes include smoking and airborne irritants video (2:39)
9 CYSTIC FIBROSIS a genetic condition cells lining the airways release thick, sticky mucus that clogs the lungs difficulty breathing may have more bacterial infections since mucus cannot be removed no cure Relieve symptoms by mucus-thinning medications and antibiotics gene therapy has been used since 1993 in an attempt to provide the correct DNA to the cells that line the airways
10 LUNG CANCER uncontrolled cell division a carcinoma (tumour) forms and can grow large enough to reduce respiratory surface area tumour can break away and form more elsewhere (metastasis) symptoms: persistent cough, difficulty breathing, chest pain, loss of appetite leading cause of cancer deaths in Canada (more than 80% diagnosed die within five years) main cause is smoking, but there are others
11 DIAGNOSTIC TOOLS
12 CT SCANNING main diagnostic tool for respiratory disorders a special X ray machine (video 1:00) computed axial tomography scanner (CT or CAT scan) rotating X ray device takes 360 images of body s interior sometimes a dye is also used (A) The CT scanner takes about 1000 photographs in one complete rotation. (B) This CT scan shows the chest, with both lungs and the heart in between them (the white area near the centre of the image).
13 (A) A conventional CT scanner creates images by photographing vertical slices of the body as it slowly passes through the machine. (B) A spiral CT scanner photographs spiral cross sections of the body as it passes through the machine. The data from a spiral CT scan create a series of images of the body tissues that can be used to make 3-dimensional pictures of areas inside the body, such as the lungs. CT SCANNING a spiral CT scanner was developed in the 1980s produces a clear, detailed view of blood vessels and internal tissues in chest cavity good for detecting early lung cancer and finding internal injuries
14 TWO-PHOTON MICROSCOPY (TPM) an imaging tool microscopes emit photons of light that highlight tissue that has been fluoresced with a marker produces a 3-D image without extracting a sample can also show biochemical processes Eg. how different drugs applied to the skin are absorbed and used by the tissues
15
16 BRONCHOSCOPY Bronchial endoscopy uses a special type of endoscope examine trachea and lungs under general anesthesia, endoscope inserted down mouth/nose special attachments can : collect mucus or tissue to diagnose disorders (such as asthma) remove tumours repair damaged tissues Video (5:15)
17 TREATING LUNG CANCER 3 main techniques: 1. radiation: uses X rays or other radiation to destroy cancer cells 2. chemotherapy: uses drugs administered by mouth or injection to destroy cancer cells 3. laser surgery: removal of the area of the lung that contains tumours with a yttrium aluminum garnet (YAG) laser choice depends on: type and extent of the cancer age and health of the person
18 HOMEWORK p.464#2-6,8-12, 14-16
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