Exam 2 pt1 Flashcards
Which is more mechanically advantegous?
relatively longer muscle force arm than resistance arm
If joint torques are equal, shortening the length of the force lever will then require less force
False
What is a motor unit?
s ingle motor neuron and all the muscle fibers it inervates
A motor unit can only inervate on type of muscle
false
Which activity would result in the most amount of recruited motor units and muscle fibers?
power clean
Thoracic nerves originate from the cervical spine
false
If someone is standing on a moving platform they can never be balanced?
false
What proprioceptors located in muscle/tendon?
golgi tendon organ and muscle spindles
eccentric forces are smaller than concentric forces based on force velocity curve
false
fine motor skills typically don’t need to recruit lot of motor units to complete the task
True
when can a muscle produce the most amount of active force?
In the middle (100-300%) of the length tension curve
when can a muscle produce the most amount of total force?
when the muscle is lengthened
if the mechanical advantage is greater than one this means that the
there will be an effort advantage
a motor unit can recruit a portion of the fibers it innervates?
false
when standing have a wider base is more stable than having your feet together
True
Before a muscle can produce force, what must happen first?
the proper amount of stimulus must occur causing an action potential
active insufficiency is when a muscle is shortened to the point where it can’t produce force
True
efferent nerves
send signals from the CNS to the periphery
what are the two types of nerves that relay signals from the periphery to the CNS then back to the periphery?
efferent and afferent
large amounts of force must be produced in order to turn on the autogenic inhibitors
True
Treppe refers to the increase in muscle force coming form several maximal stimulus
True
which of the following is the major integrator of sensory impulses?
cerebellum
Which type of mechanical levers are more common in the human body?
type 3 lever
the “all or nothing” principle refers to a motor unit being able to only recruit of the muscle fibers it inervates
false
what is the brief time interval that follows a stimulus when muscle force production has not yet been generated?
latent period
what is the advantage of 3rd class levers in the human body?
allows greater range of motion
