Chapter 10, Problem 1TYR

Summary Introduction

Introduction:

Muscles are a bundle or package of fibrous tissues of the human body. It helps in locomotion and contraction of the body. It helps in maintaining the internal and external parts of the body in its respective positions. It controls the body passages and openings. It helps in heat production, which is important for the enzyme functioning for the metabolic activity in the body.

Answer to Problem 1TYR

Correct answer:

Buccinator is a muscle that is a prime mover in spitting out the mouthful of liquid. Therefore, option b is correct.

Explanation of Solution

Justify reason for the correct statement:

Buccinator is a muscle that is present in the cheek. It is involved in multiple functions like blowing, sucking, and chewing. It compresses the cheek toward the gums and teeth. It expels liquid and air. If the cheek is inflated with water or air, the buccinators get compressed and blow the liquid or air out.

Option (b) is given as “buccinator”.

The buccinator muscle is involved in the movement of cheeks.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “platysma”.

It is a thin muscle that is present superficially on the lower face and upper chest. It aids in the wide opening of the mouth. Hence, it is a wrong answer.

Option (c) is given as “risorius”.

It is a muscle involved in facial expression. Hence, it is a wrong answer.

Option (d) is given as “masseter”.

It is one of the four pairs of muscles that are involved in the chewing and biting movements of the mandible. Hence, it is a wrong answer.

Option (e) is given as, “palatoglossus”.

It is a tongue muscle. It involves in the elevation of the tongue root and closure of the oral cavity from the pharynx. Hence, it is a wrong answer.

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

Conclusion

Buccinator is a muscle of cheek that is involved in blowing, sucking, and chewing process.