U5 Practice Test Muscular System 24-25

Front

What is the role of Myosin in muscle contraction?

Back

Myosin is a thick filament that interacts with actin to facilitate muscle contraction.

Front

What is the role of Actin in muscle contraction?

Back

Actin is a thin filament that interacts with myosin during muscle contraction.

Front

What are the two types of muscle fibers?

Back

The two types of muscle fibers are slow-twitch (Type I) and fast-twitch (Type II).

Front

What is a neurotransmitter?

Back

A neurotransmitter is a chemical messenger, such as acetylcholine, that transmits signals across a synapse from one neuron to another.

Front

What are antagonistic muscles?

Back

Antagonistic muscles are pairs of muscles that work against each other to create movement.

Front

What is the function of the Z Line in a sarcomere?

Back

The Z Line defines the boundaries of a sarcomere and anchors the actin filaments.

Front

What is the function of the M Line in a sarcomere?

Back

The M Line is the middle line of the sarcomere that anchors the myosin filaments.

Front

What is the H Zone in a sarcomere?

Back

The H Zone is the area within the A Band where there is only myosin and no actin.

Front

What is the A Band in a sarcomere?

Back

The A Band is the region of the sarcomere that contains both actin and myosin filaments.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, allowing myosin to bind to actin.