Unit 6
The Respiratory System
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BUY PDFQ. Define the respiratory system. Explain the structure and functions of the respiratory system in detail.
Answer:
Definition
The respiratory system is a group of organs and structures that help in breathing. It allows the body to take in oxygen and remove carbon dioxide. The respiratory system includes the nose, mouth, pharynx, larynx, trachea, bronchi, lungs, blood vessels, and respiratory muscles.
The respiratory system is essential for life because body cells need oxygen for energy production.
Organs of the Respiratory System
• Nose
• Nasal cavity
• Pharynx
• Larynx
• Trachea
• Bronchi
• Bronchioles
• Lungs
• Alveoli
• Diaphragm
Functions of the Respiratory System
Breathing
• Helps in inhalation and exhalation
• Brings oxygen into the body
• Removes carbon dioxide from the body
Gas Exchange
• Exchange of oxygen and carbon dioxide occurs in the alveoli of the lungs
• Oxygen enters the blood
• Carbon dioxide leaves the blood
Warming and Moistening of Air
• Warms inhaled air to body temperature
• Moistens air before it reaches the lungs
Protection from Harmful Particles
• Nose hairs and mucus trap dust and germs
• Coughing and sneezing help remove irritants
Speech Production
• Air passing through the vocal cords produces sound
• Helps in speaking and communication
Sense of Smell : Helps detect smells through the olfactory nerve
Maintenance of Acid-Base Balance
• Removes excess carbon dioxide from the body
• Helps maintain normal pH of blood
Structure and Functions of Respiratory Organs
Nose
Functions
• Entry passage for air
• Filters dust particles
• Warms and moistens air
Pharynx
Functions : Passage for air from nose to larynx
Larynx
Functions
• Known as the voice box
• Produces sound
• Prevents food from entering the trachea
Trachea
Functions
• Carries air to the bronchi
• Supported by cartilaginous rings
Bronchi
Functions
• Carry air into the lungs
• Divide into smaller bronchioles
Lungs
Functions
• Main organs of respiration
• Contain alveoli for gas exchange
Alveoli
Definition
Alveoli are tiny air sacs present in the lungs.
Functions
• Site of gaseous exchange
• Oxygen passes into blood
• Carbon dioxide passes out of blood
Diaphragm
Functions
• Main muscle of respiration
• Helps in inhalation and exhalation
Mechanism of Breathing
Inhalation
• Diaphragm contracts and moves downward
• Chest cavity expands
• Air enters the lungs
Exhalation
• Diaphragm relaxes and moves upward
• Chest cavity becomes smaller
• Carbon dioxide-rich air leaves the lungs
Importance of the Respiratory System
• Supplies oxygen to body tissues
• Removes waste gases
• Helps in speech and smell
• Maintains acid-base balance
• Essential for survival
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