Why Are Ribs 11 and 12 Called Floating Ribs

question 80

Multiple Choice

Why are ribs 11 and 12 called floating ribs?

• A)They do not connect with the body of the sternum but they do attach to the xiphoid process.
• B)They do not connect with the sternum at all.
• C)They connect to the sternum by shared costal cartilages.
• D)They connect to the sternum by individual costal cartilages.
• E)They are the only ribs that articulate with the thoracic vertebrae.

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Definitions:

Heritability Estimates

Statistical calculations that attempt to measure how much of the variation in a trait within a population can be attributed to genetic differences among individuals.

Fraternal Twins

Twins that develop from two different eggs fertilized by two different sperm, resulting in siblings that are genetically distinct.

Identical Twins

Twins that develop from a single fertilized egg, sharing 100% of their genetic material and often used in studies to explore the nature vs. nurture debate.

Gray Matter

A major component of the central nervous system, consisting of neuronal cell bodies, dendrites, and unmyelinated axons, associated with processing and cognition.