See It · Muscle Physiology

Contraction Chain

Put the steps in order, then figure out what breaks when one link fails.

0:00 Relaxed mode (timer hidden) Color by act

How to play

Drag a card up or down, or use the ▲ ▼ buttons.
Press Check my order as often as you like. Green cards are in the right spot.
Hint moves one card to its correct spot.
Start with Act 1. Build up to the full chain.

Act 1 · Nerve talks to muscle Act 2 · Signal releases calcium Act 3 · Filaments slide Relaxation

Turn colors off when you are ready for a challenge.

1. Which link in the chain is broken?

2. So what happens to the muscle?

Dr. Akash Garg · See It: Anatomy & Physiology · Pair with the Contraction Walkthrough. Printable card sort available as a separate PDF.