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Questions and Answers
The respiratory system brings oxygen into the body and adds carbon dioxide.
False
The nose and mouth are responsible for exchanging oxygen and carbon dioxide.
False
The trachea divides into multiple bronchioles.
False
The diaphragm muscle separates the chest cavity from the abdominal cavity.
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The rib cage protects the lungs and hinders breathing.
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Oxygen diffuses out of the blood in the alveoli.
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Study Notes
Overview
The respiratory system is a complex biological system that brings oxygen into the body and removes carbon dioxide.
Functions
- Brings oxygen into the body
- Removes carbon dioxide from the body
- Regulates pH levels by removing hydrogen ions
Organs Involved
- Nose and mouth: air enters the body through the nose or mouth
- Trachea (windpipe): air passes through the trachea, which divides into two bronchi
- Bronchi: air passes through bronchi, which divide into smaller bronchioles
- Bronchioles: air passes through bronchioles, which lead to the alveoli
- Alveoli: oxygen diffuses into the blood, and carbon dioxide diffuses out
- Diaphragm: muscle that separates the chest cavity from the abdominal cavity, aids in breathing
- Lungs: organs that exchange oxygen and carbon dioxide
- Rib cage: protects the lungs and aids in breathing
Process of Breathing
-
Inhalation
- Diaphragm contracts, increasing chest cavity volume
- Rib cage expands, increasing chest cavity volume
- Air enters the lungs through the nose or mouth
- Air passes through the trachea, bronchi, and bronchioles
- Air reaches the alveoli, where oxygen diffuses into the blood
-
Exhalation
- Diaphragm relaxes, decreasing chest cavity volume
- Rib cage descends, decreasing chest cavity volume
- Air is pushed out of the lungs through the nose or mouth
Gas Exchange
- Oxygen diffuses from the alveoli into the blood
- Carbon dioxide diffuses from the blood into the alveoli
- Oxygen is transported to the body's cells
- Carbon dioxide is removed from the body through exhalation
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Description
Learn about the functions and organs involved in the respiratory system, including the process of breathing and gas exchange. Understand how oxygen is brought into the body and carbon dioxide is removed.
