Chapter 32, Problem 33A

Summary Introduction

Introduction:

The voluntary muscles are the muscles that can is very much under a person’s control as it works as per the will of a person. They are attached to bones hence can also be called as skeletal muscles. They help in the movement of body parts as biceps and triceps.

Answer to Problem 33A

Correct answer:

The correct answer is option (C).

Explanation of Solution

Explanation/justification for the correct answer:

Option (c) muscle type shown in C is skeletal muscle cell that is a voluntary muscle cell. The cells are multinucleated and striated. They are not branched.

Explanation for incorrect answer:

Option (a) muscle type shown in A is smooth muscle cell that is an involuntary muscle cell. The cells are non-striated and contain single nucleus. They are tapered.

Option (b) muscle type shown in B is cardiac muscle cell is an involuntary muscle cell. The cells are striated and contains single nucleus. They have branched structure.

Conclusion

The voluntary muscles are shown in option C as they are striated and linear which is a kind of skeletal muscles that comes under voluntary muscle type.