SLIDING FILAMENT THEORY - lesson 2

Question 1

what is the sliding filament theory?

Answer 1

explains how sarcomere shorten = shortening myofibrils = shortens muscle = movement

Question 2

what is the first step of the sliding filament theory?

Answer 2

motor neuron stimulates the muscle fiber with a neural impulse

Question 3

what is the second step of the sliding filament theory?

Answer 3

calcium is released into the sarcomere

Question 4

what is the third step of the sliding filament theory?

Answer 4

actin filament reveals a binding site for the myosin head to connect

Question 5

what is the fourth step of the sliding filament theory?

Answer 5

myosin head attaches to the actin filament, creating a cross-bridge

Question 6

what is the fifth step of the sliding filament theory?

Answer 6

Breakdown of ATP releases energy to stimulate cross bridges

Question 7

what is the sixth step of the sliding filament theory?

Answer 7

Myosin cross-bridges perform a power stroke which pulls the Actin

Question 8

what is the seventh step of the sliding filament theory?

Answer 8

Sarcomere shortens as actin filaments move closer together, sliding across myosin

Question 9

what is the eighth step of the sliding filament theory?

Answer 9

Z-lines are pulled closer together, I-Band and H-Zone shorten and can disappear (A-Band stays the same length)

Question 10

what is the ninth step of the sliding filament theory?

Answer 10

The process keeps repeating if the neural impulse is present or muscle relaxes if neural impulse ends