Question Video: Identifying the Primary Function of the Skull | Nagwa Question Video: Identifying the Primary Function of the Skull | Nagwa

Question Video: Identifying the Primary Function of the Skull Biology • Third Year of Secondary School

Which of the following is a primary function of the skull? [A] To provide support for cranial nerves [B] To provide oxygen and essential nutrients to the brain [C] To act as a reserve of stem cells to replace dead or damaged nerve cells [D] To protect the brain from injury

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Video Transcript

Which of the following is a primary function of the skull? (A) To provide support for cranial nerves. (B) To provide oxygen and essential nutrients to the brain. (C) To act as a reserve of stem cells to replace dead or damaged nerve cells. Or (D) to protect the brain from injury.

The skull is the portion of the skeleton that encases the brain, connects to the vertebral column, or spine, and houses some of the important sensory organs, such as the eyes, ears, and tongue. While cranial nerves do run through portions of the skull, the skull does not particularly provide support for these nerves, and they run through other portions of the body as well, such as the neck, outside of the skull. Therefore, we can eliminate choice (A).

And the circulation of blood through the brain tissues are what provide oxygen and essential nutrients to the brain. The skull is not part of the circulatory system and so does not play a role in this. We can therefore also eliminate (B).

And while bone marrow does store stem cells, that is not a primary function of the skull, which as we can see is particularly adapted for various purposes beyond just being a bone. Additionally, nerve cells particularly are rarely replaced beyond a certain point in development. So, for both of these reasons, we can eliminate (C).

However, the skull does provide a hard covering to protect the soft tissues of the brain, which is one of the very most important organs in the proper functioning of the body. So, the correct answer to this question is (D). A primary function of the skull is to protect the brain from injury.

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