Muscular System Physiology

Front

What are the thin filaments within a sarcomere that are pulled on by thick filaments?

Back

Actin

Front

What is the only action skeletal muscles can perform on bones?

Back

Pull

Front

What type of muscle contraction does not result in the shortening of a muscle and does not produce movement?

Back

Isometric

Front

What neurotransmitter is released into the neuromuscular junction to stimulate muscle contraction?

Back

Acetylcholine

Front

What are the thick filaments within a sarcomere that contain protrusions with club-shaped heads?

Back

Myosin

Front

What is the functional unit of a muscle fiber called?

Back

Sarcomere

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.

Front

What is the difference between isotonic and isometric contractions?

Back

Isotonic contractions result in muscle shortening and movement, while isometric contractions generate force without changing muscle length.

Front

What is the energy source for muscle contraction?

Back

Adenosine triphosphate (ATP) is the primary energy source for muscle contraction.

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscles contract by the sliding of actin filaments over myosin filaments.