Chapter 12, Problem 1A

Summary Introduction

Introduction:

Skeletal system is called as the body’s structural framework. It comprises of the connective tissues, bones, ligaments, cartilages and tendons for supporting and protecting the internal systems and organs. The bones of the body vary greatly in their shape and size.

Answer to Problem 1A

Correct answer:

Spongy bone contains red bone marrow, where the cells of the blood form. Therefore, option (b) is correct.

Explanation of Solution

Reason for the correct statement:

The long bone of the legs and arms comprises of a spongy bone. This bone consists of the red bone marrow, in the spaces present between the bones. Red bone marrow is responsible for producing all types of blood cells.

Option (b) is given as “contain red bone marrow, where the blood cells are formed”.

“Spongy bone contains red bone marrow, where the blood cells are formed”, it is the right answer.

Hence, option (b) is correct.

Reasons for the incorrect statements:

Option (a) is given as “contains osteons”.
Spongy bone does not consist of the osteons; instead it is the compact bone that possesses it. So, it is a wrong answer.

Option (c) is given as “weakens bones”.
A spongy bone does not weaken the bones; instead it provides strength. So, it is a wrong answer.

Option (d) is given as “takes up most of a leg bone”.
The spongy bone does not take up most of the portion of the long bone. So, it is a wrong answer.

Option (e) is given as “All of these are correct”.
All of the above statements together are not correct as only the red bone marrow is present in the spongy bone. So, it is a wrong answer.

Hence, options (a), (c), (d) and (e) are incorrect.

Conclusion

:

Spongy bone contains red bone marrow, where the cells of the blood form.