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Reflexes Knowledge-Based Practice

Biology · Human Body & Physiology · Biology · Nervous System & Senses

5 Biology practice questions on Reflexes. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    During a painful withdrawal reflex initiated by stepping on a sharp object, which functional response is produced by the crossed-extensor reflex in the opposite (contralateral) lower limb?

    • A) Contraction of extensor muscles to support body weight and maintain posture
    • B) Contraction of flexor muscles to rapidly lift the opposite foot off the surface
    • C) Complete inhibition of both flexor and extensor motor neurons to prevent movement
    • D) Direct activation of sensory nociceptors without involving motor neuron pathways
  2. 2.

    Which of the following effectors is regulated by an autonomic (visceral) reflex rather than a somatic reflex?

    • A) Skeletal muscle fibers in the quadriceps
    • B) Skeletal muscle fibers in the forearm
    • C) Smooth muscle tissue within the bladder wall
    • D) Skeletal muscle fibers in the abdominal wall
  3. 3.

    Which of the following reflexes is categorized as a cranial reflex whose integration center is located in the brainstem rather than the spinal cord?

    • A) Pupillary light reflex
    • B) Patellar reflex
    • C) Achilles tendon reflex
    • D) Withdrawal reflex
  4. 4.

    Which structural feature distinguishes a monosynaptic reflex arc, such as the patellar reflex, from a polysynaptic reflex arc?

    • A) The absence of afferent sensory neurons
    • B) The transmission of impulses directly through the cerebral cortex
    • C) The absence of interneurons between the sensory and motor neurons
    • D) The direct connection between effector organs and the spinal cord without efferent pathways
  5. 5.

    Which sequence correctly represents the flow of a nerve impulse through the components of a typical somatic spinal reflex arc?

    • A) Effector → motor neuron → interneuron → sensory neuron → receptor
    • B) Receptor → motor neuron → interneuron → sensory neuron → effector
    • C) Receptor → sensory neuron → interneuron → motor neuron → effector
    • D) Receptor → interneuron → sensory neuron → motor neuron → effector

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