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 one sarcomere.
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 one sarcomere. 
D)A sarcomere contains thick and thin filaments.

Quizplus · Accepted Answer

The figure shows the structure of a muscle cell and highlights the sarcomeres, which are the repeating units that make up myofibrils. Within a sarcomere, there are thick and thin filaments that slide past each other during muscle contraction. Each muscle cell contains multiple myofibrils and many sarcomeres. While muscle cells have multiple nuclei, not just one, and myofibrils are composed of sarcomeres, not muscle cells. Therefore, the correct answer is that a sarcomere contains thick and thin filaments.

Examine the Structure of a Muscle Cell in the Accompanying