Podcast
Questions and Answers
What is the initial step in the process of inhalation?
What is the initial step in the process of inhalation?
- Bronchi divide the air
- Diaphragm moves upward
- Air is expelled through the nostrils
- Sternum moves outward (correct)
Which part of the respiratory system filters out large dust particles during breathing?
Which part of the respiratory system filters out large dust particles during breathing?
- Mucus in the windpipe
- Alveoli
- Nostril hairs (correct)
- Bronchi
Where does oxygen pass into the blood from during breathing?
Where does oxygen pass into the blood from during breathing?
- Nostrils
- Bronchi
- Alveoli (correct)
- Bronchioles
What is formed when oxygen passes into the blood in the alveoli?
What is formed when oxygen passes into the blood in the alveoli?
What is the role of mucus in the nasal cavity during breathing?
What is the role of mucus in the nasal cavity during breathing?
What controls the process of breathing according to the text?
What controls the process of breathing according to the text?
What is the primary purpose of cellular respiration in living cells?
What is the primary purpose of cellular respiration in living cells?
Which type of respiration occurs in the absence of oxygen?
Which type of respiration occurs in the absence of oxygen?
What is the main product of alcoholic fermentation?
What is the main product of alcoholic fermentation?
Which organism uses lactic acid fermentation for milk fermentation?
Which organism uses lactic acid fermentation for milk fermentation?
What happens to human muscles during strenuous activity due to insufficient oxygen supply?
What happens to human muscles during strenuous activity due to insufficient oxygen supply?
How does rapid breathing after strenuous activity help human muscles recover?
How does rapid breathing after strenuous activity help human muscles recover?
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Study Notes
- During breathing, two main processes occur: inhalation and exhalation.
- Inhalation begins with the diaphragm moving downward and the sternum outward, creating space in the lungs and allowing air to be sucked in through the nostrils.
- Air passes through nostrils hairs that filter out large dust particles, while mucus and cilia remove smaller dust particles and microbes in the nasal cavity.
- Mucus also warms and moistens the air as it enters the windpipe, where it is further purified.
- Air is divided by bronchi and enters the lungs, where it is further divided by bronchioles and reaches millions of alveoli.
- Alveoli, covered with a large number of blood vessels, only allow oxygen to pass into the blood and form oxyhemoglobin.
- Oxyhemoglobin then reaches the heart and is pumped to cells throughout the body, where oxygen is used for energy generation and carbon dioxide is produced.
- Carbon dioxide is absorbed by the blood and returned to the heart, which pumps it to the lungs for exhalation.
- Exhalation occurs when the diaphragm moves inwards and the sternum moves backward, pressurizing gases to be expelled through the nostrils.
- The process of breathing is controlled by the brain.
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