NeuroscienceLesson 1 of 1 in the course The Somatic Nervous System

Human Sensory Systems: Receptors, Transduction, and Sensory Pathways

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Sensory systems detect changes inside and outside the body and convert them into signals the nervous system can process. This lesson introduces how sensations become perceptions and how receptors are classified.

A stimulus is a change in the environment, such as pressure on the skin, a chemical in food, or light entering the eye. A sensory receptor responds to a stimulus by changing its membrane potential. This process, called sensory transduction, can generate a graded receptor potential and, in a sensory neuron, action potentials. Signals travel to the central nervous system (CNS), where they may be integrated with other sensory information and cognitive processes. Integration can produce conscious perception and may also lead to a motor response.

All flashcards

What is sensory transduction?
The conversion of stimulus energy into a change in receptor membrane potential that can produce neural signaling.
How do sensation and perception differ?
Sensation is receptor activation by a stimulus; perception is central processing of sensory information into a meaningful experience.
What are exteroceptors, interoceptors, and proprioceptors?
Exteroceptors detect external stimuli, interoceptors monitor internal conditions, and proprioceptors provide information about body position and movement.
What distinguishes general senses from special senses?
General sense receptors are distributed throughout the body; special senses are associated with dedicated organs.
What stimuli do major functional receptor classes detect?
Chemoreceptors detect chemicals, mechanoreceptors physical deformation, thermoreceptors temperature, photoreceptors light, and nociceptors potentially damaging stimuli.

Quiz questions

  1. Where along the cochlea are high-frequency sounds represented most strongly?Answer: Near the cochlear base.
  2. Which cranial nerves carry taste information from taste buds?Answer: Facial, glossopharyngeal, and vagus nerves.
  3. Which inner-ear structures detect rotational head movement?Answer: The semicircular canals.
  4. Why does the optic disc create a blind spot?Answer: It lacks photoreceptors.
  5. Which spinal root carries sensory axons toward the spinal cord?Answer: The dorsal root.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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