Dad's Biology Lesson
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So question 1- What are antagonistic muscles?
They're a pair of muscles that work against each other. One flexes, the other one relaxes to move. For an example, walking or moving your arm.
Okay, what happens when Ca2+ gets released by the sarcoplasmic reticulum?
The Ca2+ binds to troponin of the actin filament, which exposes binding sights. Myosin heads then bind to them.
Why is ATP important for muscle contraction (Sliding-Filament Theory wise)?
It breaks the cross-bridge between the myosin and actin filament. Funfact- ATP then gets hydrolyzed to ADP and an inorganic phosphate.
Yes. The myosin is pulling the actin towards the center (aka, the m-line) so it'a pulling on the z line also.
Last one, does the z-line move closer together when the muscle is contracting?
Thanks for the help, Dad!
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