Lungs and lung disease

HideShow resource information
  • Created by: Jenny
  • Created on: 18-05-13 10:33
View mindmap
  • Lungs and lung disease
    • Structure
      • Lungs
      • Trachea
      • Bronchi
      • Bronchioles
      • Alveoli
        • Lungs
    • Mechanism
      • Expiration
        • Intercostal muscles contract
        • Ribs move downwards and inwards- decreasing volume
        • Diaphragm muscles relax- return to dome shape
        • Decrease in volume thorax increase pressure
        • Pulmonary pressure greater than atmosphere- air forced out
      • Inspiration
        • External muscles contract
        • Rips pulled upwards and outwards- increasing volume
        • Diaphragm muscles contract- flatterns
        • Increase in volume of thorax decrease pressure
        • Atmosphere pressure greater than pulmonary- air forced out
    • Features
      • Large SA to volume ratio
      • Very thin
      • Partially permable
      • movement of internal medium
      • Movement of the environmental medium
    • Pulmonary Tuberculosis
      • Cause and symptoms
        • Caused by Mycobacterium tuberculosis
        • Persistent cough
        • Tiredness
        • loss of appetite
        • Fever and coughing up blood
      • Transmission
        • Spread  through the air- released when infected individual sneezes, cough, laugh  or even talk
        • Groups at greater risk
          • In close contact with infected individual over long period of time
          • Work or live in long term care facilities
          • Countries were TB is common
          • Those with weakened immunity
    • Pulmonary Fibrosis
      • Effects
        • Shortness of breath, especially when excerising
        • Chronic , dry cough
        • Pain and discomfort in the chest
        • Weakness and Fatigue
      • Scars form on the epithelium of the lungs- irreversible thickened
        • Lengthens diffusion pathway
        • reduce in elasticity
        • volume of air reduced
    • Asthma
      • Allergens cause whit blood cells to release histamine
        • Lining of airways become inflamed
        • cells of epithelium lining secrete excess mucus
        • Fluid leaves capillaries into airways
        • Muscles around bronchioles conact
      • Effects
        • Difficulty breathing
        • Wheezing sound when breathing
        • Tight feeling in chest
        • Coughing
    • Emphysema
      • Elastin has become permanently stretched
        • No longer able to force all air out of aveoli
      • Effects
        • Shortness of breath
        • Chronic cough
        • Blue skin colouration

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Health, illness and disease resources »