Respiratory System and Breathing

Overview of Respiration

• Respiration Process: Breathing in oxygen and out carbon dioxide.
• Frequency: Body breathes approximately 20,000 times a day, equating to about 600 million breaths by age 70.
• Functionality: Respiration is automatic and vital for survival.

Components of the Respiratory System

• Main Parts: Nose, throat, voice box, windpipe, and lungs.
• Nose and Nasal Passage:
  • Air enters through nostrils, filtered, warmed, and moistened.
  • Cilia: Tiny hairs filter dust and particles.
• Mouth: Alternative pathway for air intake.
• Pharynx (Ferx):
  • Located at the back of the throat.
  • Carries both food and air, used for digestion and respiration.

Air and Food Pathways

• Esophagus: Pathway for food leading to the stomach.
• Trachea: Pathway for air, leading to the lungs.
  • Epiglottis: Flap covering air passage during swallowing to prevent food/liquid entry into lungs.

Voice Box and Windpipe

• Larynx (Voice Box):
  • Located at the top of the trachea.
  • Contains vocal cords.
• Trachea (Windpipe):
  • 2-3 cm tube extending from the larynx about 12 cm downwards.
  • Walls reinforced with stiff cartilage rings.
  • Lined with cilia to sweep out particles and fluids.

Lungs and Air Pathways

• Branches of the Windpipe:
  • Two branches entering each lung.
  • Divides into smaller branches called bronchioles.
• Alveoli:
  • Tiny air sacs at the end of bronchioles.
  • Surrounded by capillaries for gas exchange.

Gas Exchange

• Oxygen: Passes through alveoli into bloodstream.
• Carbon Dioxide: Transfers from bloodstream to alveoli to be exhaled.

Impact of Exercise on Respiration

• Increased Oxygen Demand: Exercise increases need for oxygen by muscles.
• Respiratory Response:
  • Faster and deeper breathing.
  • Lungs work harder to maintain oxygen supply and expel carbon dioxide.
• Long-term Benefits:
  • Exercise enlarges chest cavity.
  • More capillaries form around alveoli, improving gas exchange efficiency.
• Conclusion: Physical activity enhances respiratory system effectiveness, supporting body movement.