Chapter 5.2-2 - Skeletal Muscle Actions - Skeletal Fiber Types

Multiple Choice

Which of the following best describes the primary function of skeletal muscles?

• To pump blood throughout the body

• To transmit nerve impulses

• To produce movement by contracting and relaxing

• To store minerals

Multiple Select

Select all statements that correctly describe Type IIb muscle fibers. (There are 2 correct answers)

• They contract very rapidly.

• They fatigue slowly.

• They are a type of fast-twitch fiber.

• They are intermediate in contraction speed.

Multiple Choice

Which of the following is NOT a category of skeletal muscle fibers?

• Slow-twitch (Type I)

• Fast-twitch (Type II)

• Intermediate-twitch (Type III)

• Type IIb

Multiple Choice

What are the two major categories of muscle fiber arrangement within skeletal muscles?

• Parallel and circular

• Pennate and spiral

• Parallel and pennate

• Spiral and longitudinal

Multiple Choice

Which of the following is NOT a type of parallel fiber arrangement in skeletal muscle architecture?

• Fusiform

• Bundled

• Triangular

• Unipennate

Multiple Select

Select all characteristics that apply to pennate fiber arrangements in skeletal muscles.

• Fibers attach obliquely to a central tendon

• Fibers run parallel along the length of the muscle

• Can be unipennate, bipennate, or multipennate

• Promotes contraction through interconnections