Respiratory System
Biology · श्वसन तंत्र · 12 facts
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Respiration: breathing in O2 and releasing CO2; energy production
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Path: nose->pharynx->larynx->trachea->bronchi->bronchioles->alveoli
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Nose: filters, warms, moistens air; nasal hair traps dust
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Larynx: voice box; contains vocal cords for speech
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Trachea(windpipe): C-shaped cartilage rings keep it open
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Lungs: spongy organs in chest; right(3 lobes), left(2 lobes)
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Alveoli: tiny air sacs; site of gas exchange(O2 in, CO2 out)
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Diaphragm: dome-shaped muscle; contracts for inhalation
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Haemoglobin in RBC carries O2 from lungs to tissues
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Breathing rate: 15-20 breaths/minute in adults at rest
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Aerobic respiration: C6H12O6+6O2->6CO2+6H2O+ATP (with oxygen)
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Anaerobic: without O2; in muscles produces lactic acid(cramps)