Question

Identify the feature(s) of muscle myofibrils:

a) Hold muscle cells together.
b) Are found in the sarcolemma.
c) Do not appear striated.
d) Extend from the sarcolemma to the T-tubule.
e) Contain myosin and actin myofilaments.

Answer 1

Muscle myofibrils contain myosin and actin myofilaments, extend from the sarcolemma across the muscle fiber, and contribute to the striated appearance of skeletal muscle.

Step-by-step explanation:

The feature(s) of muscle myofibrils include:

• Contain myosin and actin myofilaments: Myofibrils are made of repeating units called sarcomeres, which contain thick (myosin) and thin (actin) filaments.
• Extend from the sarcolemma to the T-tubule: Myofibrils attach at the sarcolemma and span the entire length of the muscle cell.
• Appear striated: The organized arrangement of actin and myosin myofilaments creates a banding pattern that appears as striations.

Other features, such as holding muscle cells together or being found in the sarcolemma, are not characteristics of myofibrils.