Human Physiology: Motor System and Reflex
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Questions and Answers

Which structure is responsible for detecting changes in muscle length and initiating the stretch reflex?

  • Motor unit
  • Premotor cortex
  • Basal ganglia
  • Muscle spindle (correct)

Which part of the brain is responsible for coordinating voluntary movements and sending signals to the spinal cord?

  • Cerebellum
  • Primary motor cortex (correct)
  • Basal ganglia
  • Brain stem

What type of motor neurons innervate extrafusal muscle fibers and are responsible for muscle contraction?

  • Alpha motor neurons (correct)
  • Gamma motor neurons
  • Delta motor neurons
  • Beta motor neurons

Which part of the motor system is involved in the coordination and smooth execution of movements, as well as in maintaining posture and balance?

<p>Cerebellum (A)</p> Signup and view all the answers

Which area of the brain is responsible for initiating movements and activating lower motor neurons in the spinal cord?

<p>Primary motor cortex (area 4) (D)</p> Signup and view all the answers

What is the role of the premotor cortex (area 6) in the motor system?

<p>Coordination of movements (C)</p> Signup and view all the answers

Which part of the brain is responsible for coordinating voluntary movements and sending signals to the spinal cord?

<p>Motor homunculus (A)</p> Signup and view all the answers

What is the function of the frontal lobe in the motor system?

<p>Coordinates skilled movements (C)</p> Signup and view all the answers

Which neuronal pathways secrete neurotransmitter substances in the basal ganglia to balance action between excitatory and inhibitory neurotransmitters?

<p>Subthalamic nucleus (D)</p> Signup and view all the answers

What is the role of the basal ganglia in the motor system?

<p>Plan actions (A)</p> Signup and view all the answers

Which part of the brain is responsible for regulating subconscious movements such as writing and cutting paper?

<p>Putamen (A)</p> Signup and view all the answers

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