Question 1

Which of the following best describes the correct sequence of events in a simple reflex arc?

Accepted Answer

Sensory receptor → Sensory neuron → Interneuron → Motor neuron → Effector

Question 2

Which pathway is responsible for transmitting fine touch and proprioceptive information to the brain, and where does decussation occur in this pathway?

Accepted Answer

Posterior column pathway; decussation occurs in the medulla oblongata

Question 3

Decussation in the nervous system refers to:

Accepted Answer

The crossing of nerve fibers from one side of the central nervous system to the other

Question 4

The sensory homunculus is a representation of:

Accepted Answer

The relative amount of sensory cortex devoted to different body regions

Question 5

Which statement best describes the difference between the sensory and motor homunculus?

Accepted Answer

The sensory homunculus maps sensation, while the motor homunculus maps voluntary movement

Question 6

Where is the primary sensory cortex located in the brain?

Accepted Answer

Postcentral gyrus of the parietal lobe

Question 7

Which area of the brain is responsible for the production of dopamine, and which disease is associated with the destruction of these neurons?

Accepted Answer

Substantia nigra; Parkinson's disease

Question 8

Lewy bodies found in neurons of Parkinson's disease patients are primarily composed of which protein?

Accepted Answer

Alpha-synuclein

Question 9

Which of the following is NOT a major symptom of Parkinson's disease?

Accepted Answer

Hyperreflexia

Question 10

How do mitochondria and autophagosomes contribute to the pathology of Parkinson's disease?

Accepted Answer

Mitochondrial dysfunction and impaired autophagy lead to neuronal death

Question 11

Which of the following best explains how regular exercise can reduce symptoms and progression of Parkinson's disease?

Accepted Answer

Exercise increases neurotrophic factors and improves mitochondrial function

Question 12

In the corticospinal pathway, what is the primary role of the upper motor neuron?

Accepted Answer

To transmit motor commands from the cerebral cortex to the spinal cord

Question 13

Which of the following best describes the role of the lower motor neuron in voluntary movement?

Accepted Answer

It directly innervates skeletal muscle fibers to produce movement

Question 14

A patient is unable to consciously move their arm after an insect lands on it, but can still feel the sensation. Which neural structure is most likely damaged?

Accepted Answer

Primary motor cortex

Question 15

Which equation best represents the concept of homeostasis in a reflex arc?

Accepted Answer

$\Delta S = S_{stimulus} - S_{response}$

Question 16

If sensory information from the right arm is transmitted to the brain, through which pathway and at which anatomical location does the signal cross to the opposite side?

Accepted Answer

Posterior column pathway; decussation in the medulla oblongata

Question 17

Which of the following best describes the flow of information when you consciously move your arm in response to an insect landing on it?

Accepted Answer

Sensory receptors → Posterior column pathway → Primary sensory cortex → Primary motor cortex → Corticospinal tract → Lower motor neuron → Muscle

Question 18

Which of the following is a plausible consequence of damage to the substantia nigra?

Accepted Answer

Decreased dopamine production leading to motor deficits

Question 19

Which glial cell type is most involved in the response to neuronal injury in Parkinson's disease?

Accepted Answer

Microglia

Question 20

A lesion in the precentral gyrus would most likely result in which of the following deficits?

Accepted Answer

Impaired voluntary movement

unit 2: Neural Pathways, Reflexes, and Motor Control: Study Guide for Anatomy & Physiology

Study Guide - Practice Questions

Study Guide - Flashcards