Chapter 32, Problem 7STP

Summary Introduction

Introduction:

There are five categories of bones named as: flat, long, short, irregular and sesamoid. Out of which the irregular bones are useful for many purposes as in the protection of nervous tissue, muscle attachment, maintaining support, etc. Irregular bones are used for joining the parts of spinal column altogether. The spine consists of the most irregular bones.

Answer to Problem 7STP

Correct answer:

The correct answer is option (c) vertebrae.

Explanation of Solution

Explanation/justification for the correct answer:

Option (c) Irregular bones got different shape and structure that helps in protecting the internal organs. The vertebrae got the maximum number of irregular bones of that protects the spinal cord. There are around thirty three irregular bones found in the spinal cord.

Explanation for incorrect answer:

Option (a) leg bones are formed of two bones, tibia and fibula. They are categorized under the long type not the irregular one.

Option (b) skull bones are flat bones not irregular bones. Their function is to protect the internal organs such as brain, heart and pelvic organs.

Option (d) wrist bones are short bones as found in the bones of the carpal bones in the hands or the tarsal bones in the feet. Wrist contains eight small carpal bones that are very small in shape.

Conclusion

The spinal cord present in the vertebrae is the type of bone that is classified as irregular.