Chapter 10, Problem 1DYKB

Summary Introduction

Introduction :

Skeletal muscle is also called voluntary muscle. These muscles help in the movement of the body parts. Skeletal muscles are presently connected with the skeleton by tendons. A skeletal muscle fiber is present as long thin fibers which are called skeletal muscle fibers. Their main function is to perform daily activities and movements and maintain posture and balance.

Answer to Problem 1DYKB

Correct answer :

The correct answer is option (d) skeletal muscle fiber.

Explanation of Solution

Explanation/justification for the correct answer :

Option (d) skeletal muscle fiber. The skeletal muscle is composed of numerous small muscle fibers, these muscle fibers are long and cylindrical and together form an organ that is skeletal muscle. Now, this muscle fiber is surrounded by a connective tissue called the endomysium. So, the correct answer is option (d).

Explanation for incorrect answer :

Option (a) myofibril. Myofibrils are bundles of different myofilaments. These myofibrils are present as the compact of several thin and thick myofilaments. They are not surrounded by endomysium. So, this is an incorrect option.

Option (b) fascicle. The fascicle is the part of the skeletal muscle that contains many muscle fibers together. It is a small cylinder bundle. The fascicle is surrounded by the perimysium, not by the endomysium. So, this is an incorrect answer.

Option (c) myofilament. Myofilaments are the protein filaments present in the muscle cells. The proteins are actin, myosin, and titin. There are two types of them, thick and thin, the thick myofilaments are surrounded by the thin myofilaments, not by the endomysium. So, this is an incorrect option.