Front

What stimulates muscle fibers to develop new filaments of actin and myosin?

Back

When a weightlifter uses muscles to exert more than 75% of their maximum tension.

Front

What is the outermost layer of connective tissue of a muscle called?

Back

Epimysium.

Front

Why are facial expressions variable?

Back

Many facial muscles are inserted in the skin.

Front

What is the primary function of anterior thigh muscles?

Back

They serve as prime movers of extension of the leg at the knee joint.

Front

Where do chest and shoulder muscles that move the arm at the shoulder joint insert?

Back

On the humerus.

Front

What are the three types of muscle tissue in the muscular system?

Back

Skeletal, cardiac, and smooth muscle.

Front

What is the role of actin and myosin in muscle contraction?

Back

They interact to cause muscle contraction through the sliding filament theory.

Front

What is the function of the epimysium?

Back

It surrounds the entire muscle and provides protection and support.

Front

How do facial muscles differ from other skeletal muscles?

Back

Facial muscles are often inserted into the skin, allowing for a wide range of expressions.

Front

What is the significance of the knee joint in leg movement?

Back

It acts as a hinge joint, allowing for extension and flexion of the leg.