PSL300 - MOTOR, ANS, & MUSCLE
(PART 1) Exam Questions and Answers
Graded A+
Is there a hierarchy to brain organization? - Correct answer-Yes, the brain is very
hierarchically organized, in that there is a hierarchical level of organization of how
different groups of neurons (nuclei) control the motor movement
What is the simplest form of motor control? - Correct answer-Simple reflexes; to
mediate sensory reflexes, sensory neurons make synapses with spinal cord
motoneurons
Are reflexes innate and genetically determined? - Correct answer-For the most
part, yes; many reflexes are innate and are genetically determined (eg. knee-jerk
reflex)
What happens to reflexes as we age? - Correct answer-When you are born, you are
born with all kinds of reflexes, primitive reflexes; however, we lose a lot of them
as we get older (even at a few months old) --> So for example, in newborn infants,
if you touch their cheek they turn their head towards the stimulus (and obviously
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, this doesn't happen to you now otherwise I your head would turn whenever I touch
you; also, if you stroke their palm, then they will grab with so much force that they
can actually support their own weight, but obviously you don't do that anymore)
If you cradle an infant and tilt to stimulate falling, their arms will extend forward
What does reflex mean? - Correct answer-"Bending back" - basic element of motor
control
What is bent back is the signal a sensory signal because it all starts with a specific
sensory stimulus which is detected by the sensory receptors --> this information is
carried into the CNS by the sensory afferents and is quickly processed within the
nervous system
(we know that the central nervous system is the integrating center that evaluates all
incoming information and select san appropriate response)
THIS IS OUR INPUT
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
(PART 1) Exam Questions and Answers
Graded A+
Is there a hierarchy to brain organization? - Correct answer-Yes, the brain is very
hierarchically organized, in that there is a hierarchical level of organization of how
different groups of neurons (nuclei) control the motor movement
What is the simplest form of motor control? - Correct answer-Simple reflexes; to
mediate sensory reflexes, sensory neurons make synapses with spinal cord
motoneurons
Are reflexes innate and genetically determined? - Correct answer-For the most
part, yes; many reflexes are innate and are genetically determined (eg. knee-jerk
reflex)
What happens to reflexes as we age? - Correct answer-When you are born, you are
born with all kinds of reflexes, primitive reflexes; however, we lose a lot of them
as we get older (even at a few months old) --> So for example, in newborn infants,
if you touch their cheek they turn their head towards the stimulus (and obviously
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, this doesn't happen to you now otherwise I your head would turn whenever I touch
you; also, if you stroke their palm, then they will grab with so much force that they
can actually support their own weight, but obviously you don't do that anymore)
If you cradle an infant and tilt to stimulate falling, their arms will extend forward
What does reflex mean? - Correct answer-"Bending back" - basic element of motor
control
What is bent back is the signal a sensory signal because it all starts with a specific
sensory stimulus which is detected by the sensory receptors --> this information is
carried into the CNS by the sensory afferents and is quickly processed within the
nervous system
(we know that the central nervous system is the integrating center that evaluates all
incoming information and select san appropriate response)
THIS IS OUR INPUT
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
