Biology
Form II
BIO-F2-04
✓ Verified TIE Syllabus
Gaseous Exchange and Respiration in Mammals
Respiratory mechanics and bioenergetics: mammalian lung anatomy, alveolus gas exchange, breathing mechanisms, aerobic versus anaerobic cellular respiration, and respiratory illnesses.
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🎯 Syllabus Competencies & Learning Objectives
Key Competencies
- Main: 1.0 Demonstrate mastery of the concepts, principles and processes of Biology
- Specific: 1.1 Describe the physiological, anatomical and ecological processes of living organisms
Specific Learning Objectives
- Distinguish between breathing, gaseous exchange, and cellular respiration.
- Describe the anatomy of the human respiratory system (trachea, bronchi, bronchioles, alveoli).
- Explain inhalation and exhalation mechanisms involving diaphragm and intercostal muscles.
- Compare aerobic respiration with anaerobic respiration (lactic acid fermentation and alcoholic fermentation).
- Discuss factors affecting respiration rate and common respiratory diseases (TB, asthma, pneumonia).
📖 Comprehensive Study Notes Summary
### Gaseous Exchange and Respiration
#### Inhalation vs Exhalation
- **Inhalation**: External intercostal muscles contract (ribs move up and out), diaphragm flattens. Thoracic volume increases -> pressure decreases below atmospheric -> air rushes in.
- **Exhalation**: External intercostals relax (ribs move down and in), diaphragm domes. Thoracic volume decreases -> pressure rises -> air forced out.
#### Aerobic vs Anaerobic Respiration
- **Aerobic**: C6H12O6 + 6O2 -> 6CO2 + 6H2O + 38 ATP (high energy yield).
- **Anaerobic (Mammalian Muscle)**: C6H12O6 -> 2 Lactic acid + 2 ATP (causes muscle fatigue and oxygen debt).
- **Anaerobic (Yeast)**: C6H12O6 -> 2 Ethanol + 2CO2 + 2 ATP.
#### Inhalation vs Exhalation
- **Inhalation**: External intercostal muscles contract (ribs move up and out), diaphragm flattens. Thoracic volume increases -> pressure decreases below atmospheric -> air rushes in.
- **Exhalation**: External intercostals relax (ribs move down and in), diaphragm domes. Thoracic volume decreases -> pressure rises -> air forced out.
#### Aerobic vs Anaerobic Respiration
- **Aerobic**: C6H12O6 + 6O2 -> 6CO2 + 6H2O + 38 ATP (high energy yield).
- **Anaerobic (Mammalian Muscle)**: C6H12O6 -> 2 Lactic acid + 2 ATP (causes muscle fatigue and oxygen debt).
- **Anaerobic (Yeast)**: C6H12O6 -> 2 Ethanol + 2CO2 + 2 ATP.