Question
Science Question on The respiratory system
In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be:
A
lifted ribs and curve/dome shaped diaphragm.
B
lifted ribs and flattened diaphragm.
C
relaxed ribs and flattened diaphragm.
D
relaxed ribs and curve/dome shaped diaphragm.
Answer
lifted ribs and flattened diaphragm.
Explanation
Solution
During inhalation:
• The ribs are lifted upward and outward, increasing the chest cavity volume.
• The diaphragm contracts and flattens, creating a vacuum that draws air into the lungs.