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Sagot :
Our body needs oxygen to do its work and to survive. Breathing system or the respiratory system involves the process of inhalation and exhalation. Higher concentration of oxygen in the atmosphere causes the oxygen to enter our body during inhalation via the respiratory tract passageway. The oxygen will enter nose as the external organ of the breathing system. It travels to the Nasal cavity for the air to be moistens, warms and filter. The air will then move to the pharynx which is a common passageway of food and air. Pharynx is divided into three region, nasopharynx, oropharynx, and laryngopharyx. As we inhale, the epiglottis will open the passageway of air to the larynx and moves down to the lower passageway of the breathing system known as trachea which is also known as the windpipe. It will then move into the right bronchi to enter the right lung and left bronchi to enter the left lung. Bronchi are branching into smaller tube called bronchioles. And finally, after the bronchioles, the air will then reach the alveoli which is the actual site of gas exchange between oxygen and carbon dioxide.
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The passageway of oxygen as it goes into the lungs
- Nose
- Nasal cavity
- Pharynx
- Larynx
- Trachea
- Bronchi
- Bronchioles
- Alveoli
Nose
The external organ of breathing system which receives the oxygen during inhalation.
Nasal cavity
Oxygen is modified in the nasal cavity before it enters the lower breathing system which the air is warmed, cleaned, and moistened.
Pharynx
Common passageway of food and air. Pharynx is divided into three region, nasopharynx, oropharynx, and laryngopharyx.
Larynx
Receives the oxygen coming from the pharynx as moves down through the epiglottis.
Trachea
also known as windpipe; it receives the air from the larynx and connects it to the bronchi below it.
Bronchi
also called bronchial tubes; two branching tubes that connect the trachea to the right and left lungs.
Bronchioles
Finer subdivision of bronchi, a hairlike tube that connects to the alveoli.
Alveoli
The actual site of gas exchange between oxygen from the atmosphere and carbon dioxide as waste product of metabolism in the body.
Higher concentration of oxygen in the alveoli diffuses to the lower concentration of oxygen in the blood. When oxygen diffuses to the blood, it will bind to the hemoglobin making the the blood oxygenated. Oxygenated blood are being pumped by the heart to be delivered in different parts of the body.
List of Muscles involved during Inhalation
- External Intercostals muscles
- Diaphragm
- Sternocleidomastoid Muslces
- Pectoralis minor
All of these muscles will contract during inhalation to facilitate air to move into the lungs particularly the oxygen air.
List of Muscles involved during Exhalation
- Internal Intercostals Muscles
- Diaphragm
- Abdominal Muscles
- Quadratus Lumborum
All these muscles will contract except for the diaphragm to facilitate exhalation of carbon dioxide gas.
To know more about the muscles involved in inhalation and exhalation kindly visit the link:
brainly.ph/question/594345
brainly.ph/question/9945
Remember that oxygen are mixed with other substances in the atmosphere including dust and other foreign substances including microorganism. The oxygen also in the atmosphere are cooler compared to the temperature our internal body. Before the oxygen reaches the internal part of the breathing system, it is being modified in the nasal cavity and filtered.
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