Steps of Muscle Contraction

What would be the correct order of the steps?

• 1, 2, 3, 4

• 4, 3, 2, 1

• 3, 4, 1, 2

• 2, 1, 3, 4

Tags

NGSS.HS-PS2-5

When the action reaches the muscle cell, it travels down the....

• Sarcolemma

• T Tubules

• Sarcoplasmic Reticulum

• Calcium Channel

The action potential releases __________ from the Sarcoplasmic Reticulum (SR)

After calcium is released from the SR, it binds to _________

• troponin

• tropomyosin

• actin

• myosin

Place the steps of muscle contraction in the correct order

a

b

c

d

e

f

g

1

6

5

2

4

3

7

____________ attaches to actin to form the cross bridge.

• Troponin

• Tropomyosin

• Myosin

• Calcium

What must occur first before a muscle can contract?

• An action potential must develop as energy/nutrients is gained from the digestive system

• An action potential must travel to the muscle through the circulatory system

• An action potential must enter the body through the respiratory system

• An action potential must be sent through neurons in the nervous system

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.

• Muscle cell

• Gland

• Neuron

• None of the above

Troponin moves the ____________ uncovering binding sites.

• actin

• troponin

• tropomyosin

• myosin

binds to myosin head causing myosin to release actin.

• ATP

• ADP

• Actin

• Calcium