Multiple Choice
Which of the following is not included in the thoracic cage?
7. The Skeletal System
The Thoracic Cage
Multiple Choice
When giving chest compressions during CPR the thoracic cavity can flex in and out without breaking bones. What is one reason that the thoracic cage is able to flex in this manner?
A
Flexible costal cartilage comprises a large portion of the anterior thoracic cage.
B
Ribs have a curved shape allowing them to flex and bend easily.
C
The floating ribs have no connection to the sternum allowing the thoracic cage to change shape easily.
D
The sternum is made of three bones that can easily bend where they form joints with each other.
Verified step by step guidance1
Understand the structure of the thoracic cage: The thoracic cage is composed of the sternum, ribs, and costal cartilages. It provides protection to the heart and lungs while allowing for respiratory movements.
Identify the role of costal cartilage: Costal cartilage connects the ribs to the sternum and is made of hyaline cartilage, which is flexible and allows for movement and expansion of the rib cage during breathing.
Consider the shape and structure of the ribs: The ribs are curved and somewhat elastic, which allows them to absorb impact and flex without breaking easily.
Examine the role of floating ribs: The last two pairs of ribs, known as floating ribs, do not attach to the sternum, providing additional flexibility to the thoracic cage.
Analyze the composition of the sternum: The sternum consists of three parts (manubrium, body, and xiphoid process) that are connected by joints, allowing for slight movement and flexibility during chest compressions.
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