Muscular System Part 3:

Question 1

What happens in the first step in the sliding filament theory?

Answer 1

1. In the sarcromere, calcium ions change the shape of the proteins

Question 2

What happens in the second step in the sliding filament theory?

Answer 2

2. The myosin then latches onto the actin strands

Question 3

What happens in the third step in the sliding filament theory?

Answer 3

3. Myosin drags actin strands toward each other (sarcomere then contracts)

Question 4

What does the calcium have to do?

Answer 4

It has to unbind the myosin hooks

Question 5

What are muscles activated by?

Answer 5

Motor neurons

Question 6

What is the sarcoplasmic reticulum?

Answer 6

Its the thing wrapped around each sarcomere
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