U5 Sliding Filament Theory

Front

What type of muscle is attached to bones?

Back

Skeletal muscle.

Front

What are the thin filaments in a myofibril?

Back

Actin.

Front

What is a bundle of muscle cells called?

Back

Fascicle.

Front

What does the sliding filament theory explain?

Back

It explains how muscle contraction occurs.

Front

What does the sliding filament theory describe about muscle fibers?

Back

It explains how the muscle fibers shorten as the actin and myosin filaments pull on each other.

Front

What are the two main types of filaments involved in muscle contraction?

Back

Actin and Myosin.

Front

What is the role of myosin in muscle contraction?

Back

Myosin heads bind to actin filaments and pull them, causing muscle contraction.

Front

What is a sarcomere?

Back

The basic contractile unit of muscle tissue.

Front

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

Back

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

Front

What triggers the contraction of muscle fibers?

Back

The release of calcium ions from the sarcoplasmic reticulum.