The sliding filament theory Flashcards
1
Q
Each sarcomere has thick parallel filaments called? , and thinner filaments called?
A
myosin - actin
2
Q
Sarcomeres are the functional units of contraction and are connected by ______ at either end of the sarcomere.
A
Z- bands
3
Q
What is it that gives skeletal muscle its striated appearance?
A
it is the difference in thickness of myosin and actin filaments that give the muscle fibre its striated appearance.
4
Q
When a muscle receives an impulse to contract, the theory says that _____ segments slide along the ______ filaments.
A
actin segments - myosin filaments
5
Q
What is the source of energy for the movement from densely packed mitochondria that surround the myofibrils
A
ATP
6
Q
How far can a muscle be stretched?
A
sarcomeres can be stretched to 150% of their resting length
