Sliding Filament Theory

What is the neurotransmitter involved in stimulating muscle contraction?

• Tropomysosin

• Acetylcholine

• Calcium ions

• Pyruvate

Which of the following statements is true about the sliding filament theory?

• During contraction the H zone remains the same length

• A cross-bridge is formed by troponin and tropomysin attaching to one another

• A nerve impulse causes an action potential to spread across the muscle

• ATP is released around the filaments, stimulating the muscle to contract

According to the sliding filament theory, which of the following change in length during isotonic muscle contraction?

I. A band

II. H Zone

III. Sarcomere

• I and II only

• I and III only

• II and III only

• I, II and III

In the sarcome, which of the following is the thick filament?

• Actin

• Z line

• Myosin

• M Line

Acetylcholine allows the muscle to relax

• True

• False

Low calcium concentrations myosin binding sites on actin are covered by tropomyosin?

• True

• False

The sarcoplasmic reticulum releases the neurotransmitter acetylcholine

• True

• False

Cross bridge formation is terminated when ADP and Pi are resynthesised to ATP?

• True

• False

Action potentials are electrical signals that tell muscle tissue to contract.

• True

• False

T tubules transport acetylcholine across the neuromuscular junction

• True

• False