Certified Instrument Specialist (CIS) Practice Exam 2025 - Free CIS Practice Questions and Study Guide

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What is the role of cortical bone in the skeletal system?

It provides cushioning between joints

It supports the outer layer and shape of bones

Cortical bone, also known as compact bone, plays a crucial role in providing structural support and strength to the skeletal system. It forms the outer layer of bones and contributes to their overall shape and density. This dense and tightly packed arrangement of bone tissue is essential for bearing weight and withstanding forces during activities such as walking, running, and jumping.

While other types of bone, like trabecular (or spongy) bone, are involved in different functions such as housing bone marrow (where blood cell production occurs) or storing fat, cortical bone's primary function lies in its ability to support the skeletal structure. It ensures that bones are not only strong but also provides a protective outer layer for the inner, more porous bone types. This dual-functional structure is vital for overall skeletal health and function.

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It aids in blood cell production

It stores fat for energy

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