Practical #3: The Sacromere & Events at the Neuromuscular Junction

What are the red beads labeled #1 in the Sacromere model?

Actin (thin filaments)

What are the blue rods in center labeled #2?

Myosin (thick filaments)

What are the blue projections sticking out labeled #3?

Myosin heads (cross bridges)

What are the green dots on the actin labeled #4?

Troponin

What is the yellow strand running along actin labeled #5?

Tropomyosin

What is the red zig zag structure labeled #6?

Z-line (z disc)

What is the functional unit between label #7?

Sarcomere

Nerve cell that stimulates muscle:

Motor neuron

Connection between neuron & muscle:

Neuromuscular junction (NMJ)

End of the neuron:

Axon terminal

Chemical released to send signal:

Neurotransmitter

Gap between neuron & muscle:

Synaptic cleft

Muscle membrane at NMJ:

Motor end plate

Electrical signal traveling along membrane:

Action potential

Muscle cell membrane:

Sarcolemma

What is labeled at #1 of the Neuromuscular Junction?

Muscle fiber

What is labeled #2 of the Neuromuscular Junction?

Axon (motor neuron)

What is labeled #3 of the Neuromuscular Junction?

Axon Terminal

What structure is shown in this image?

Neuromuscular Junction