Roles of muscles
The “prime mover” of an action traditionally acts…
concentrically
Mechanical, chemical, and electrical stimulation are all methods to reach a(n)
action potential
This muscle fiber arrangement allows more range of motion
parallel
A slower muscle contraction produces ___________ force
more
Another name for a muscle cell is
Muscle fiber
When the origin of a muscle moves towards the insertion, this is known as a ___________ action
A motor unit is made up of these two structures
Motor neuron and muscle fibers
The optimal position for a muscle to be in to contract fully and powerfully
resting length
During poor posture, these types of muscles are more likely to get short and tight
Postural muscles
Fascicles are wrapped in this fascia
Perimysium
Type I
A motor unit firing simultaneously and completely is known as
all or none
Actin and myosin create a __________________ when they connect, which then allows them to perform a ______________, thus creating a muscle contraction
cross bridge; power stroke
A power lifter would most likely have more of what type of muscle fibers?
Type II B
the deepest layer of fascia around muscle is
endomysium
during a bicep curl, the "down" portion would be considered:
__________ contraction
__________ action
__________ kinetic chain
eccentric
normal
open
In order to create a more powerful contraction, a muscle will recruit more motor units before the muscle has fully relaxed. This is an example of
wave summation
The deltoid is considered ______________. The biceps brachii is considered __________________.
multipennate; fusiform/bicipital
The most distal attachment of a muscle is the
origin
these myofilaments block actin from myosin when there is no action potential
troponin, tropomyosin