L3 PT Muscle Anatomy Quiz

What is the function of the epimysium?

• It surrounds individual muscle fibers.

• It covers the entire muscle, providing an outer layer of protection.

• It bundles muscle fibers into fasciculi.

• It connects muscles to bones.

Which structure is responsible for connecting muscles to bones?

• Tendon

• Perimysium

• Epimysium

• Endomysium

What is the role of the perimysium?

• It surrounds individual muscle fibers.

• It covers the entire muscle.

• It bundles muscle fibers into fasciculi.

• It connects muscles to bones.

Which of these is the smallest unit within a muscle fibre?

• Bone

• Fasciculi

• Myofibril

• Tendon

What is the name of the connective tissue that surrounds individual muscle fibers?

• Epimysium

• Perimysium

• Endomysium

• Fasciculi

What is the role of the sarcoplasmic reticulum in a myofibril?

• It is the muscle's cell membrane.

• It stores the calcium reservoirs ready for release on demand.

• It is the cell fluid of the myofibril/sarcomere.

• It blocks the binding sites on the actin filament.

What is the sarcolemma?

• The network of tubes that store calcium.

• The muscle's cell membrane.

• The cell fluid of the myofibril/sarcomere.

• The molecules that block the binding sites on the actin filament.

What are troponin and tropomyosin responsible for in the sliding filament theory?

• Generating tension/muscle contraction.

• Storing calcium reservoirs.

• Blocking the binding sites on the actin filament.

• Being the muscle's cell membrane.

During which phase of the sliding filament theory does the myosin head bind to the actin?

• Cocking Phase

• Binding Phase

• Power Stroke

• Re-setting

What happens during the Power Stroke stage of the sliding filament theory?

• The myosin head is primed with energy.

• The myosin head binds with the actin-binding sites.

• The myosin head rotates, pulling the actin towards the centre of the sarcomere.

• ATP binds to the myosin head, releasing it from the actin binding site.