Respiratory system  

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  • Created by: mary
  • Created on: 04-11-12 00:03
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  • Respiratory system
    • order : air passages -trachea -bronchi-bronchioles- alveoli
    • partial pressure - gasses move high to low
    • inspiration: diaphragm down , intercostal muscles contract, pressure reduced, air sucked into lungs, chest expands.
      • expiration: diaphram relax    domed, intercostal muscles relax, pressure in lungs increases, air forced out.
    • internal resp - gaseous exchange at alveoli. o2 for co2, alveoli covered in capplillaries, alveoli allow co2 out and o2 in - diffusion!
      • internal resp  - exchange co2 and o2 in muscle cells.
    • effects of training  on lungs - increase lung vol and capacity - improve transport co2 and o2 - more efficient in and ex  gasseous exchange - improve uptake of o2 by muscles
    • bhor shift - incresed co2 and  myoglobin releases o2
    • minuet ventilation - air in and out in 1 min. in exercise tidal vol will depend on intensity of exercise.
    • easier diffusion - large surface area of alveoli - large blood supply - thin membrane - short diffusion distance - layer of moisture - small cappilaries.
    • disassociation curve - o2 diffused to working muscles from blood = disassociation of o2.  curve at rest 's'  o2 delivered with ease. during exercise greater demand for o2 's' to the right - bhor shift.
    • spirometer trace - measures lung capacity and volumes. in exercise increased tidal vol - more freaquant peaks closer  together
    • lung volumes and capacities: normal breath in = tidal vol force all air out = expiatory reserve vol volume of air left in lungs after max expiration = residual volume max air in = inspiratory capacity max air out = vital capacity complete volume of air in lungs after max inspiration = total lung volume
  • minuet ventilation - air in and out in 1 min. in exercise tidal vol will depend on intensity of exercise.

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