IB Biology HL B3.3.8 Hl Intercostal Muscles Questions
Explore how amino-acid R-group chemistry changes solubility, interactions, folding and protein function in IB Biology HL B1.2.6.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain that external intercostal muscles contract to lift the ribs up and out during inspiration, increasing thoracic volume and lowering pressure.
- Explain that internal intercostal muscles contract to pull the ribs down and in during forced expiration, reducing thoracic volume and raising pressure.
- Distinguish the antagonistic external- versus internal-intercostal actions and use rib direction or pressure evidence to identify inspiration or forced expiration.
IB Biology HL B3.3.8 Hl Intercostal Muscles Questions question 1
[Maximum number: 1]
What occurs during inspiration?
A
Internal intercostal muscles contract, increasing the pressure in the thorax.
B
Internal intercostal muscles contract, decreasing the pressure in the thorax.
C
External intercostal muscles contract, decreasing the pressure in the thorax.
D
External intercostal muscles contract, increasing the pressure in the thorax.
C
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