Question

question 23
1 pts
during respiration, the thorax
becomes smaller when the chest is raised.
becomes larger when the chest is raised.
does not change.
none of the above.
question 24
1 pts
the roof of the nose is separated from the cranial cavity by a portion of the ethmoid bone called the
cribriform plate.
cleft palate.
palatine bone.
ala.

Explanation:

• Question 23: During inhalation (when the chest is raised), the diaphragm contracts and moves downward, and the intercostal muscles contract to lift the ribs. This increases the volume of the thoracic cavity (thorax), creating a lower pressure inside the lungs compared to the outside, allowing air to flow in. So, the thorax becomes larger when the chest is raised.
• Question 24: The ethmoid bone has a cribriform plate. The cribriform plate forms the roof of the nasal cavity and separates it from the cranial cavity. A cleft palate is a congenital defect in the palate (not related to separating the nose roof from the cranial cavity). The palatine bone is part of the palate structure. The ala is a wing - like structure (e.g., ala of the nose is a cartilaginous structure on the side of the nose), not related to the ethmoid bone's role in separating the nose roof and cranial cavity.

Answer:

• Question 23: becomes larger when the chest is raised.
• Question 24: cribriform plate.