anatomy: muscles review

Identify the red structures? A fibrous protein that forms (together with actin) the contractile filaments of muscle cells.

• actin

• myosin

• tropomyosin

• troponin

• cross bridge

Identify the blue structures? a protein that forms (together with myosin) the contractile filaments of muscle cells.

• actin

• myosin

• tropomyosin

• troponin

• cross bridge

Identify X? A protein that covers the mysoin binding sites on the actin filament in a relaxed muscle, preventing contraction.

• actin

• myosin

• tropomyosin

• troponin

• cross bridge

Identify the pink structures? It is a globular protein complex, occuring with tropomyosin in the thin filaments of muscle tissue. Binds to calcium ions, moving tropomyosin away from the myosin binding sites on actin filaments.

• actin

• myosin

• tropomyosin

• troponin

• cross bridge

Identify the structure. It binds to thin filamentous actin, and uses ATP hydrolysis to generate force to pull actin toward the center of the sarcomere

• actin

• myosin head

• tropomyosin

• troponin

• cross bridge

tiny chains of contractile units between 2 Z disks, which are aligned end to end

• H
• Z
• synaptic cleft
• sarcomere

a neurotransmitter that stimulates skeletal muscles

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

the only energy source that can be used to directly power muscle activity

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

when myosin heads attach to the binding sites on actin it is called

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

point where a neuron and the sarcolemma of a skeletal muscle join

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction