A/P-Ch 9: Muscles and Muscle Tissue

Front

What is the basic contractile unit of a muscle fiber that extends from one Z disc to another?

Back

Sarcomere

Front

What happens to a muscle when it contracts?

Back

It gets shorter.

Front

Which type of muscle tissue is found only in the heart?

Back

Cardiac muscle.

Front

What is the name of the plasma membrane surrounding a skeletal muscle cell?

Back

Sarcolemma.

Front

What connective tissue surrounds a fascicle in a muscle?

Back

Perimysium.

Front

What are the three types of muscle tissue?

Back

Skeletal, cardiac, and smooth muscle.

Front

What is the role of the Z disc in a sarcomere?

Back

It serves as the attachment point for actin filaments.

Front

What is the function of the sarcoplasmic reticulum in muscle cells?

Back

It stores and releases calcium ions during muscle contraction.

Front

What is the difference between voluntary and involuntary muscle tissue?

Back

Voluntary muscle tissue is under conscious control (e.g., skeletal muscle), while involuntary muscle tissue is not (e.g., cardiac and smooth muscle).

Front

What is the role of myosin in muscle contraction?

Back

Myosin is a motor protein that interacts with actin to produce muscle contraction.