wunder beta

📘 How muscles turn nerve signals into motion

Follow motor neurons, calcium, ATP, actin, myosin, and sarcomeres from signal to movement.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Motor neuron
T-tubules
Calcium
Myosin head
Power stroke
Sarcomere
Recruitment
Relaxation
Energy
Whole motion

Questions this course answers

What does acetylcholine do at the neuromuscular junction?

Acetylcholine activates receptors that initiate a muscle action potential.

Why is calcium important?

Calcium binding permits myosin to bind actin.

What happens in the power stroke?

Myosin changes conformation and pulls the thin filament.

How can force be graded?

More active fibers and overlapping twitches increase force.

What restores relaxation?

Lower calcium lets tropomyosin block actin again.

Grounded in trusted sources

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Every Wunder lesson is built from real, reputable sources — never invented.

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