Examine the structure of a muscle cell in the accompanying figure.Which one of the following statements about muscle structure is true?
A) Each muscle cell has one nucleus.
B) Each myofibril consists of many muscle cells.
C) Each muscle cell has two to three sarcomeres.
D) A sarcomere contains thick and thin filaments.

Question

Examine the structure of a muscle cell in the accompanying figure.Which one of the following statements about muscle structure is true? 
A) Each muscle cell has one nucleus. 
B) Each myofibril consists of many muscle cells. 
C) Each muscle cell has two to three sarcomeres. 
D) A sarcomere contains thick and thin filaments.

Quizplus · Accepted Answer

The image shows a cross section of a muscle cell, and within it, a sarcomere can be seen. A sarcomere is the functional unit of a muscle and is composed of thick and thin filaments. Therefore, statement D is true. Statement A is false because a muscle cell, also known as a muscle fiber, can have multiple nuclei. Statement B is false because a myofibril consists of multiple sarcomeres, not multiple muscle cells. Statement C is also false because a muscle cell can have multiple sarcomeres, not just two to three.

Examine the Structure of a Muscle Cell in the Accompanying