Muscle Contraction Action

The actual muscle contraction is caused by...

• the thick myofilament pulling the thin myofilament to the M line

• the thick filament pulling the tropomyosin to the M line

• calcium binding to troponin

• calcium returning to the terminal cisternae

What causes the myosin head to release the binding site on the actin molecules?

• Calcium

• ATP

• Tropomyosin

• Acetylcholine

Tags

NGSS.HS-LS1-7

What happens right after the myosin head releases the actin?

• Acetylcholine floods the synapse

• ATP breaks down, myosin head returns to ready position

• Calcium returns to terminal cisternae

• The muscle contracts

Which occurs first... neuromuscular junction action or sliding filament action.

• Neuromuscular junction action

• Sliding filament action

• both happen at the same time

• they have nothing to do with eachother

When the nerve and muscle are at rest

• their membranes are positive on the outside, negative on the inside

• their membranes are negative on the inside, positive on the outside

• myosin heads are in mid power stroke

• acetylcholine floods the synapse

What happens after the depolarization of the axon terminal

• the muscle contracts

• the muscle depolarizes

• calcium leaves the terminal cisternae

• vesicles of acetylcholine exit the nerve

What happens right after the nerve receives a stimulus?

• muscle depolarizes

• nerve depolarizes

• vesicles dump acetylcholine into the synpse

• muscle contracts

• everything resets, ready to contract again

What happens right after the nerve depolarizes?

• muscle depolarizes

• nerve receives a stimulus

• vesicles dump acetylcholine into the synpse

• muscle contracts

• everything resets, ready to contract again

What happens right after the muscle depolarizes?

• muscle depolarizes

• nerve depolarizes

• vesicles dump acetylcholine into the synpse

• muscle contracts

• everything resets, ready to contract again

What happens right after the nerve dumps acetylcholine into the synapse?

• muscle depolarizes

• nerve depolarizes

• vesicles dump acetylcholine into the synpse

• muscle contracts

• everything resets, ready to contract again