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Questions and Answers
During inhalation, which of the following occurs?
During inhalation, which of the following occurs?
- Diaphragm moves down and rib cage expands (correct)
- Diaphragm moves down and rib cage contracts
- Diaphragm moves up and rib cage contracts
- Diaphragm moves up and rib cage expands
What is the main component of inhaled air?
What is the main component of inhaled air?
- Water vapor
- Oxygen
- Carbon dioxide
- Nitrogen (correct)
When air pressure inside the lungs increases, what process occurs?
When air pressure inside the lungs increases, what process occurs?
- Inhalation
- Respiration
- Gas exchange
- Exhalation (correct)
What happens to the level of oxygen in exhaled air?
What happens to the level of oxygen in exhaled air?
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What is the main function of respiration?
What is the main function of respiration?
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What happens to carbon dioxide levels during exhalation?
What happens to carbon dioxide levels during exhalation?
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Which muscle helps fill the lungs with air during inhalation?
Which muscle helps fill the lungs with air during inhalation?
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Study Notes
- Importance of breathing and gas exchange: Oxygen is brought into the body for respiration, which provides energy for all cells; carbon dioxide is removed.
- Gases in inhaled air: Oxygen makes up about 21%, carbon dioxide less than 1%; nitrogen, the main component, is about 78%.
- Gases in exhaled air: Oxygen decreases to about 16%, carbon dioxide increases to around 4%; water vapor and other gases in small quantities increase.
- The respiratory system: Diaphragm, a flat muscle at the bottom of the lungs, helps fill the lungs with air during inhalation and empties them during exhalation.
- Breathing process: Diaphragm moves down, rib cage expands, and lungs fill with air; reverse process occurs during exhalation.
- Lungs and respiration: Lungs receive air from the trachea; ribs and muscles surrounding them help expand the lungs during inhalation.
- Inhalation process: Diaphragm moves down, rib cage expands, and air pressure decreases, causing air to be drawn in.
- Exhalation process: Diaphragm moves up, rib cage contracts, and air pressure inside lungs increases, causing air to be expelled.
- Continuous process: Breathing process occurs 24/7.
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