Motor Control Final Exam-Graded A
A muscle that requires fine movement skills requires approximately which number of
muscle fibers per motor neuron?
A. 100
B. 1000
C. 2000 - correct answer-A. 100
A single motor nerve and all of the muscle fibers that it supplies are referred to as a:
A. synapse
B. motor unit
C. motor junction
D. motor end plate - correct answer-B. motor unit
A motor unit contains which of the following:
A. spinal synapse
B. brain tissue
C. mitochondria
D. reflex arc - correct answer-C. Mitochondria
A central pattern generator originates at the nervous system "level" of...
A. the motor cortex
B. the peripheral nerve
C. the spinal cord
D. the skeletal muscle - correct answer-C. the spinal cord
which type of stimulation will produce the most force?
A. Twitch
B. Unfused tetanic
C. Fused or complete tetanic - correct answer-C. fused/complete tetanic
the motor units in intact humans normally produce what type of contractions?
A. Twitch
B. Unfused tetanic
C. Fused or complete tetanic - correct answer-C. unfused/incomplete tetanic
when our nervous system produces higher rates of muscle stimulation (more stimuli
sent per second), the outcome is
A. increased force output
B. decreased force output
C. no change in force output - correct answer-A. increased force
,Motor unit recruitment is governed by Henneman's size principle, which states:
A. that motor units are recruited large to small
B. that motor units are recruited small to large
C. that motor units are recruited fast to slow
D. that motor units contain the nerve and muscle fiber - correct answer-B. that motor
units are recruited small to large
The job of an afferent neuron is to
A. Send impulses from the spinal cord to the muscle
B. Send impulses from the muscle to the spinal cord
C. Send impulses from the brain to the muscle - correct answer-B. send impulses from
the muscle to the spinal cord
which receptors would tell the brain that the elbow was fully extended but is now
bending quickly?
A. Golgi tendon organ
B. muscle spindle
C. chemoreceptors
D. pacinian corpuscles - correct answer-B. muscle spindle
Better coordination of a skeletal muscle may require:
A. Better reflexes
B. More myosin ATPase
C. A well-developed Golgi tendon organ
D. Lower muscle fiber number per motor unit - correct answer-D. lower muscle fiber
number per motor unit
the Golgi tendon organ senses:
A. muscle force production and inhibits it
B. muscle force production and facilitates it
C. muscle length and inhibits it
D. muscle length and facilitates it - correct answer-A. muscle force production and
inhibits it
Humans can produce smooth even muscle contractions, creating very small and very
large forces because:
A. motor neurons fire at the same frequency
B. individual motor neurons do not create a wide variety of forces
C. motor neurons produced fused tetanic contractions
D. motor neurons follow an orderly recruitment pattern - correct answer-D. motor
neurons follow an orderly recruitment pattern
In artificial experimental conditions with the muscle removed from the body, skeletal
muscle exhibits the force-length relationship. In intact animal, skeletal muscle exhibits:
A. torque by angular velocity curve
B. torque by angle curve
, C. torque by pCa++ curve
D. torque by pinnation angle curve - correct answer-B. torque by angle curve
A reason why the concept of optimal length is not particularly useful when examining
intact animals is:
A. the ranges many animal and human muscles work in fall outside of optimal length
B. the sarcomere length is different from animal to animal and human to human
C. the intact muscles are rarely stretched on either side optimal length
D. the force-velocity curve predominates in the intact animal and human - correct
answer-A. the ranges many animal and human muscles work in fall outside of optimal
length
A muscle stimulated at which frequency will likely produce the most force?
A. 10 Hz
B. 20 Hz
C. 30 Hz
D. 40 Hz - correct answer-D. 40 Hz
A woman walks down the street. Which of the following BEST estimates her percent of
motor units recruited in her leg muscles?
A. 25%
B. 50%
C. 75%
D. 100% - correct answer-A. 25%
Pfluger performed experiments on decapitated frogs. What was one of the conclusions
he reached based on these experiments?
A. Noxious stimuli have direct connections to skeletal muscle
B. Spinal reflexes can lead to activation of different muscle groups
C. Spinal reflexes can be modulated by descending input - correct answer-B. Spinal
reflexes can lead to activation of different muscle groups
Woodworth discovered that errors increase with speed when eyes are open, but when
eyes are closed, errors:
A. Increase even further
Bterm-17. Decrease below the level of eyes open
C. Decrease to the levels of the eyes open
D. Don't change - correct answer-D. Don't change
The Fenn effect refers to:
A. the heat liberated by skeletal muscle during cross-bridge formation
B. the passive spring motion of skeletal muscle
C. energy liberated during muscle relaxation
D. the heat of muscular work being used to drive or make cross-bridge formation -
correct answer-A. the heat liberated by skeletal muscle during cross-bridge formation
A muscle that requires fine movement skills requires approximately which number of
muscle fibers per motor neuron?
A. 100
B. 1000
C. 2000 - correct answer-A. 100
A single motor nerve and all of the muscle fibers that it supplies are referred to as a:
A. synapse
B. motor unit
C. motor junction
D. motor end plate - correct answer-B. motor unit
A motor unit contains which of the following:
A. spinal synapse
B. brain tissue
C. mitochondria
D. reflex arc - correct answer-C. Mitochondria
A central pattern generator originates at the nervous system "level" of...
A. the motor cortex
B. the peripheral nerve
C. the spinal cord
D. the skeletal muscle - correct answer-C. the spinal cord
which type of stimulation will produce the most force?
A. Twitch
B. Unfused tetanic
C. Fused or complete tetanic - correct answer-C. fused/complete tetanic
the motor units in intact humans normally produce what type of contractions?
A. Twitch
B. Unfused tetanic
C. Fused or complete tetanic - correct answer-C. unfused/incomplete tetanic
when our nervous system produces higher rates of muscle stimulation (more stimuli
sent per second), the outcome is
A. increased force output
B. decreased force output
C. no change in force output - correct answer-A. increased force
,Motor unit recruitment is governed by Henneman's size principle, which states:
A. that motor units are recruited large to small
B. that motor units are recruited small to large
C. that motor units are recruited fast to slow
D. that motor units contain the nerve and muscle fiber - correct answer-B. that motor
units are recruited small to large
The job of an afferent neuron is to
A. Send impulses from the spinal cord to the muscle
B. Send impulses from the muscle to the spinal cord
C. Send impulses from the brain to the muscle - correct answer-B. send impulses from
the muscle to the spinal cord
which receptors would tell the brain that the elbow was fully extended but is now
bending quickly?
A. Golgi tendon organ
B. muscle spindle
C. chemoreceptors
D. pacinian corpuscles - correct answer-B. muscle spindle
Better coordination of a skeletal muscle may require:
A. Better reflexes
B. More myosin ATPase
C. A well-developed Golgi tendon organ
D. Lower muscle fiber number per motor unit - correct answer-D. lower muscle fiber
number per motor unit
the Golgi tendon organ senses:
A. muscle force production and inhibits it
B. muscle force production and facilitates it
C. muscle length and inhibits it
D. muscle length and facilitates it - correct answer-A. muscle force production and
inhibits it
Humans can produce smooth even muscle contractions, creating very small and very
large forces because:
A. motor neurons fire at the same frequency
B. individual motor neurons do not create a wide variety of forces
C. motor neurons produced fused tetanic contractions
D. motor neurons follow an orderly recruitment pattern - correct answer-D. motor
neurons follow an orderly recruitment pattern
In artificial experimental conditions with the muscle removed from the body, skeletal
muscle exhibits the force-length relationship. In intact animal, skeletal muscle exhibits:
A. torque by angular velocity curve
B. torque by angle curve
, C. torque by pCa++ curve
D. torque by pinnation angle curve - correct answer-B. torque by angle curve
A reason why the concept of optimal length is not particularly useful when examining
intact animals is:
A. the ranges many animal and human muscles work in fall outside of optimal length
B. the sarcomere length is different from animal to animal and human to human
C. the intact muscles are rarely stretched on either side optimal length
D. the force-velocity curve predominates in the intact animal and human - correct
answer-A. the ranges many animal and human muscles work in fall outside of optimal
length
A muscle stimulated at which frequency will likely produce the most force?
A. 10 Hz
B. 20 Hz
C. 30 Hz
D. 40 Hz - correct answer-D. 40 Hz
A woman walks down the street. Which of the following BEST estimates her percent of
motor units recruited in her leg muscles?
A. 25%
B. 50%
C. 75%
D. 100% - correct answer-A. 25%
Pfluger performed experiments on decapitated frogs. What was one of the conclusions
he reached based on these experiments?
A. Noxious stimuli have direct connections to skeletal muscle
B. Spinal reflexes can lead to activation of different muscle groups
C. Spinal reflexes can be modulated by descending input - correct answer-B. Spinal
reflexes can lead to activation of different muscle groups
Woodworth discovered that errors increase with speed when eyes are open, but when
eyes are closed, errors:
A. Increase even further
Bterm-17. Decrease below the level of eyes open
C. Decrease to the levels of the eyes open
D. Don't change - correct answer-D. Don't change
The Fenn effect refers to:
A. the heat liberated by skeletal muscle during cross-bridge formation
B. the passive spring motion of skeletal muscle
C. energy liberated during muscle relaxation
D. the heat of muscular work being used to drive or make cross-bridge formation -
correct answer-A. the heat liberated by skeletal muscle during cross-bridge formation
