Notes for B3.3.8 Internal and external intercostal muscles - IB | RevisionDojo
B3.3.8 Internal and external intercostal muscles Notes
Intercostal Muscles Coordinate Inhalation and Exhalation
The intercostal muscles are located between the ribs and are essential for breathing.
They are divided into two layers: external intercostal muscles and internal intercostal muscles, with fibers oriented in different directions.
The alternating contraction of these layers moves the ribcage in opposite directions, enabling the mechanics of breathing.
Intercostal muscles
Coordinated Contraction and Relaxation
The alternating contraction of these layers moves the ribcage in opposite directions, enabling the mechanics of breathing.
Mechanism of inhalation and exhalation
During Inhalation
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Questions
Recap questions
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Question 1
Recap question
If the spring constant k of titin in the internal intercostals were to increase significantly, how would this affect the force required by the external intercostals during inhalation?
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What are the two layers of intercostal muscles?
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Note
Intercostal Muscles Coordinate Inhalation and Exhalation
The intercostal muscles are located between the ribs and play a crucial role in breathing by facilitating the expansion and compression of the ribcage.
They are arranged in two layers:
External intercostal muscles: Run diagonally downward and forward
Internal intercostal muscles: Run diagonally downward and backward
AnalogyThink of the intercostal muscles like the strings on a drawstring bag. When you pull the strings in one direction, the bag opens up (like inhalation), and when you release them, the bag closes (like exhalation).
DefinitionIntercostal MusclesMuscles located between the ribs that assist in breathing by moving the ribcage.
