Question

rib cage - 10 points
→ functions of ribs

1. protection: the ribs form a cage around vital organs such as the heart, lungs,

and major blood vessels, shielding them from physical injury.

1. support: they provide structural support to the chest cavity, maintaining its

shape and stability.

1. respiration: the ribs move upward and outward during inhalation and

downward and inward during exhalation, helping the lungs expand and contract
for breathing.

1. attachment for muscles: the ribs serve as attachment points for muscles

involved in breathing (like the diaphragm and intercostal muscles) and for
muscles of the back, chest, and upper abdomen.

1. flexibility: the cartilage connecting the ribs to the sternum

allows flexibility, enabling the chest to expand and contract without breaking.

1. protection of upper abdominal organs: the lower ribs, especially the

floating ribs, help protect organs such as the kidneys and parts of the liver and
spleen.

1. which parts of the body attach to the ribs for movement and stability?
2. how does the cartilage between the ribs and sternum help in breathing?
3. what would happen if the ribs were rigid and unable to move during respiration?

Explanation:

• For question 8: As per the "Attachment for Muscles" function, muscles (like the diaphragm and intercostal muscles) and muscles of the back, chest, and upper abdomen attach to the ribs.
• For question 9: The "Flexibility" function mentions that the cartilage connecting ribs to the sternum allows flexibility. During breathing, when the ribs move (upward - outward in inhalation and downward - inward in exhalation), this flexibility enables the chest cavity to expand and contract, which is essential for the lungs to fill with air (inhalation) and expel air (exhalation).
• For question 10: The "Respiration" function states that ribs move for breathing. If ribs were rigid, during inhalation, the chest cavity couldn't expand (as ribs can't move upward - outward), so the lungs wouldn't have enough space to fill with air. During exhalation, the chest cavity couldn't contract (as ribs can't move downward - inward), so air couldn't be expelled properly. This would severely impair the breathing process.

Answer:

1. Muscles (such as the diaphragm, intercostal muscles, and muscles of the back, chest, and upper abdomen).
2. The cartilage provides flexibility. It allows the ribs to move (upward - outward during inhalation and downward - inward during exhalation), enabling the chest cavity to expand and contract, which is necessary for the lungs to take in and expel air.
3. During inhalation, the chest cavity couldn't expand to allow the lungs to fill with air. During exhalation, the chest cavity couldn't contract to expel air. This would make proper breathing (gas exchange) extremely difficult or impossible.