Lesson 1: Sarcomere, Muscle Fiber Types, and Muscle Contraction Types Flashcards
(31 cards)
The ______ of the sarcomere can vary the ability to produce tension during movement
length
What happens to the muscle when the sarcomere length increases and tension decreases?
Extension
What happens to the muscle when the sarcomere length shortens and tension decreases?
Flexion
Optimal tension and/or force application can be produced when ___________________.
actin and myosin are optimally overlapped
We are looking for _____ overlap, not full overlap.
optimal
Why is the midpoint easiest in an exercise?
Because the actin and myosin are optimally overlapped
When the actin and myosin are completely overlapped, the tension is small/optimal/great
great
When the actin and myosin are not overlapped at all, the tension is small/optimal/great
small
True or false: People do not contain a uniform set of skeletal muscle fibers
True
2 main types of muscle fiber types:
Slow-twitch
Fast-twitch
Which muscle type is this?
Low force production
Slow-twitch (type I)
Which muscle type is this?
High force production
Fast-twitch (type II)
True or False: each motor unit is either slow-twitch or fast-twitch.
True
Which muscle type is this?
Slow contraction speed
Slow-twitch
Which muscle type is this?
Fast contraction speed
Fast-twitch
Which muscle type is this?
High resistance to fatigue
Slow-twitch
Which muscle type is this?
Smaller motor unit
Slow-twitch
Which muscle type is this?
Fatigue easily
Fast-twitch
Which muscle type is this?
Larger motor unit
Fast-twitch
In slow-twitch fibers, ATP synthesis occurs through anaerobic/aerobic means, such as
Aerobic; Lipolysis, slow glycolysis, etc.
Slow-twitch fibers have a fast/slow calcium handing ability
Slow
Why are slow-twitch fibers a darker, red color?
Because they contain large and many mitochondria
Why do slow-twitch fibers contain so much mitochondria?
To power aerobic energy systems
Slow-twitch fibers have high/low myosin ATPase activity
low
