biology respiration 🫀

• respiration def


  process by which cells of an organism release energy from food they consume
• where does it happen?

  inside all cells of all living things in structures in the cells called mitochondria
• why does respiration happen?

  move their muscles

  make new cels to grow or repair damaged tissue

  reproduce

  keep warm
• aerobic respiration 


  glucose + oxygen —> carbon dioxide + water + energy
• anaerobic respiration 


  glucose —> lactic acid + energy
• oxygen 


  inhaled 20%

  exhaled 16%
• CO2


  inhaled 0.04%

  exhaled 4%
• nitrogen


  inhaled 78%

  exhaled 78%
• inhalation


  during inhalation

  diaphram contracts and flattens

  ribcage moves up and out

  this increases volume in chest cavity

  pressure decreasess inside

  air rushes into lungs
• exhalation

  during exhalation

  diaphram relaxes and curves upwards

  ribcage moves down and in

  this decreases volume in chest cavity

  pressure increases inside

  air is forced out of lungs
• intercostal muscles 


  inhalation —> contract

  exhalation —> relax
• rib cage


  inhalation —> up and out

  exhalation —> down and in
• diaphram 


  inhalation —> contracts and flattens

  exhalation —> relaxes + curves upward
• volume in thorax


  inhalation —> increasing

  exhalation —> decreasing
• pressure in thorax 


  inhalation —> decreases

  exhalation —> increases
• air movement 


  inhalation —> air moves into lungs

  exhalation —> air moves out of lungs
• smoking related diseases 


  bronchitis

  cornory heart disease

  lung cancer

  pulmonary disease