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Biology Respiration

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QuestionAnswer
What are the two breathing movements know as? Inspiration and expiration
What is another word for inspiration? Inhalation
First step of inhalation? Intercostal muscles contract causing the ribs to move up and out
Second step of inhalation? Diaphragm contracts and flattens, volume of thorax increases
Third step of inhalation? Pressure in thorax decreases and air rushes in to fill the lungs
First step of expiration? Intercostal muscles relax causing the ribs to move down and in
Second step of expiration? Diaphragm relaxes and becomes dome shaped
Third step of expiration? Pressure in the thorax increases and air is forced out of the lungs
Summarised steps of inhalation? Intercostal muscles contract, diaphragm flattens, ribs move up and out
Summarised steps of expiration? Intercostal muscles relax, diaphragm is dome shaped, ribs move down and in
Created by: keo788
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