Dad's Biology Lesson
Updated: 5/18/2020
Dad's Biology Lesson

Storyboard Text

  • Hey Dad. Where are we going?
  • "I'm" going to help you with your homework. Follow me
  • 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!
  • Don't mention it!