Muscular System Test

What is the primary function of tropomyosin in muscle tissue?

• Binds directly to calcium ions

• Blocks myosin-binding sites during muscle relaxation

• Provides structural support to myosin

• Creates ATP for muscle contraction

The sarcomere's I bands are described as (a)  

• Contains both thick and thin filame
• Located at the boundary between sar
• Contains only thin (actin) filament
• Contains the entire length of myosi

What happens when calcium ions bind to troponin?

• Myosin heads detach from actin

• ATP is produced

• The muscle fiber relaxes

• Tropomyosin moves away from myosin-binding sites

Which characteristic of muscle tissue allows it to respond to neural stimuli?

• Elasticity

• Extensibility

• Excitability

• Contractility

What is the function of T-tubules in muscle fibers?

• Store calcium ions

• Generate electrical impulses

• Block neurotransmitter binding

• Conduct impulses deep into the muscle fiber

What is the primary neurotransmitter used at the neuromuscular junction?

• Calcium ions

• Acetylcholine (ACh)

• Serotonin

• Norepinephrine

What is the role of the sarcoplasmic reticulum?

• Produces ATP

• Stores and releases calcium ions

• Generates action potentials

• Synthesizes proteins

What type of myofilament is myosin?

• Regulatory filament

• Thin filament

• Thick filament

• Intermediate filament

In the sarcomere, the A band contains (a)  

• Only thin filaments
• The entire length of thick filament
• Only Z lines
• Only troponin

What is the function of myosin heads?

• Store calcium ions

• Bind to actin

• Produce ATP

• Block tropomyosin