Ch.8 Muscular System 2024

Front

Which is not a type of muscle fiber?

Back

Lymphatic

Front

Identify #1: What is the basic structural unit of a muscle?

Back

Sarcomere

Front

What is the contractile unit of a myofibril?

Back

Sarcomere

Front

Define extensibility in the context of muscle tissue.

Back

The ability of muscle fibers to lengthen or stretch, even past their original shape.

Front

When a muscle cell is relaxed, which protein blocks the binding site on actin?

Back

Tropomyosin

Front

What are the three types of muscle tissue?

Back

Skeletal, Smooth, Cardiac

Front

What is the primary function of skeletal muscle?

Back

To facilitate movement of the skeleton and maintain posture.

Front

What is the role of the sarcoplasmic reticulum in muscle contraction?

Back

It stores and releases calcium ions, which are essential for muscle contraction.

Front

What is the function of troponin in muscle contraction?

Back

Troponin binds to calcium ions and causes tropomyosin to move, exposing binding sites on actin.

Front

What is the difference between voluntary and involuntary muscles?

Back

Voluntary muscles are controlled consciously (e.g., skeletal muscles), while involuntary muscles operate automatically (e.g., smooth muscles).