Muscle Quiz

Which of the following decreases in length during the contraction of a skeletal muscle fiber?

• sarcomere

• myosin

• thick filament

• actin

According to the sliding filament model, binding sites on the actin open when __.

• creatine phosphate levels rise

• acetylcholine levels rise

• ATP levels rise

• calcium ion levels rise

Which type of muscle tissue has visible striations and single, centrally located nuclei?

• cardiac

• skeletal

• smooth

• fibrous

Which structure attaches muscle to bone?

• ligament

• cartilage

• nervous

• tendon

Which connective tissue covers a whole muscle?

• endomysium

• epimysium

• perimysium

• tropomysium

Acetylcholine is __.

• an ion pump on the post-synaptic membrane

• a source of energy for muscle contraction

• a component of thick myofilaments

• a neurotransmitter that stimulates skeletal muscle

What is the scientific name for a muscle fiber bundle?

• epimysium

• myofibril

• fascicle

• myofilament

What type of muscle is found in the hollow organs and is considered to be involuntary without striations?

• Cardiac
• Skeletal
• Smooth
• Cartilage

Identify this type of muscle

• smooth
• cardiac
• skeletal

The thick myofibril filament of a sarcomere is
composed of a protein:

• actin.
• myosin.
• sarcolemma.
• titin.