Question 1

Which of the following best describes the sequence of events in a typical neural reflex arc?

Accepted Answer

Receptor detects the stimulus, afferent neuron transmits signal, integration in CNS, efferent neuron transmits signal, effector responds

Question 2

A patient presents with muscle weakness that worsens with activity and improves with rest. Laboratory tests reveal antibodies against acetylcholine receptors at the neuromuscular junction. Which condition is most likely responsible?

Accepted Answer

Myasthenia gravis

Question 3

Which of the following is TRUE regarding the patellar tendon (knee-jerk) reflex?

Accepted Answer

It is a monosynaptic reflex involving direct communication between sensory and motor neurons.

Question 4

Which type of receptor is primarily responsible for detecting muscle stretch during the myotatic (stretch) reflex?

Accepted Answer

Muscle spindle

Question 5

During voluntary movement, why is alpha-gamma coactivation important?

Accepted Answer

It prevents the muscle spindle from becoming slack and losing sensitivity during muscle contraction.

Question 6

Which of the following best differentiates somatic from autonomic reflexes?

Accepted Answer

Somatic reflexes control skeletal muscle, while autonomic reflexes control smooth muscle, cardiac muscle, and glands.

Question 7

A person steps on a sharp object with their right foot and immediately withdraws it while extending the left leg to support their weight. Which reflex is responsible for this coordinated response?

Accepted Answer

Crossed-extensor reflex

Question 8

Which of the following statements about the Golgi tendon organ (GTO) is correct?

Accepted Answer

The GTO is found at the junction of muscle and tendon and detects changes in muscle tension.

Question 9

Which of the following best describes the role of the basal ganglia in movement control?

Accepted Answer

It integrates voluntary movement and is involved in motor planning.

Question 10

A patient with Parkinson's disease is most likely to have degeneration of neurons that release which neurotransmitter?

Accepted Answer

Dopamine

Question 11

Which of the following equations best represents the relationship between force ($$F$$), muscle tension ($$T$$), and the number of active motor units ($$n) in a $$simplified model?

Accepted Answer

$$F = n 	imes T$$

Question 12

Which of the following is an example of a cranial reflex?

Accepted Answer

Blink reflex

Question 13

During the micturition (urination) reflex, which nervous system division is primarily responsible for stimulating contraction of the detrusor muscle?

Accepted Answer

Parasympathetic nervous system

Question 14

Which of the following best explains why learned (conditioned) reflexes can be consciously inhibited?

Accepted Answer

They involve higher brain centers that can override the reflex pathway.

Question 15

Which of the following statements about muscle spindles is correct?

Accepted Answer

They are stretch receptors located within the muscle and detect changes in muscle length.

Question 16

A patient is unable to maintain continence and experiences involuntary urination. Which of the following is most likely impaired?

Accepted Answer

Sympathetic outflow to the bladder outlet

Question 17

Which of the following best describes the difference between monosynaptic and polysynaptic reflexes?

Accepted Answer

Monosynaptic reflexes have a single synapse between sensory and motor neurons, while polysynaptic reflexes involve one or more interneurons.

Question 18

Which of the following best describes the function of feedforward control in movement?

Accepted Answer

It anticipates and prepares the body for expected postural disturbances.

Question 19

Which of the following structures is NOT directly involved in the control of voluntary movement?

Accepted Answer

Dorsal root ganglion

Question 20

Which of the following best explains why the stretch reflex helps maintain muscle length at a desired value?

Accepted Answer

It activates alpha motor neurons in response to muscle spindle stretch, causing contraction of the same muscle.

Control of Body Movement: Neural Reflexes and Motor Pathways

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