Which of the following statement is NOT correct with respect to inhalation in mammals? The
intercostal muscles contract
diaphragm is raised
ribs are raised
Pressure of the thoracic cavity decreases
Explanation
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The answer is very correct i.e B please take note of the NOT. During inhalation the diaphragm contracts and is pulled downwards not raised.... Thank you.
When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs
During inhalation
1. The intercoastal muscles are raised
2. The diaphragm contracts and is raised
3. The pressure of the intercoastal muscles increases (not decreased)
So the correct option is D
