Myofilament Contraction Flashcards
study for test
1
Q
What does ATP stand for?
A
Adenosine triphosphate
ATP is the source of energy for use and storage at the cellular level
2
Q
Myosin
A
thick filament
has many myosin heads (bind to actin)
powered by ATP
3
Q
Actin
A
Thin Myofilament
2 actin filaments twisted tg
4
Q
2 regulatory proteins of actin
A
troponin and tropomyosin
5
Q
Tropomyosin
A
thread-like
stiffens and stabilizes actin
Blocks myosin-binding sites when muscle is relaxed
6
Q
Troponin is made of 3 subunits:
A
1 binds it to actin
1 binds it to tropomyosin
1 binds it to calcium ions
7
Q
Troponin
A
When a calcium ion binds to troponin, it pulls tropomyosin off the myosin-binding sites of actin
