Which of the following are the openings through which the brain and nervous system experience the world?

• A. Motor neurons
• B. Interneurons
• C. Sensory receptors
• D. Glial cells

Answer: (C)

Verified step by step guidance

1. Understand the role of sensory receptors: Sensory receptors are specialized structures that detect stimuli from the environment, such as light, sound, touch, temperature, and chemical signals. These receptors convert external stimuli into electrical signals that can be interpreted by the nervous system.
2. Differentiate sensory receptors from other components: Motor neurons are responsible for transmitting signals from the brain and spinal cord to muscles for movement. Interneurons act as connectors within the central nervous system, facilitating communication between sensory and motor neurons. Glial cells provide support and protection for neurons but do not directly detect external stimuli.
3. Recognize the importance of sensory receptors in perception: Sensory receptors are the primary openings through which the brain and nervous system experience the world. They are located in various parts of the body, such as the eyes (photoreceptors), ears (mechanoreceptors), skin (mechanoreceptors and thermoreceptors), and tongue (chemoreceptors).
4. Connect sensory receptors to the nervous system: Once sensory receptors detect stimuli, they send signals via sensory neurons to the central nervous system (brain and spinal cord), where the information is processed and interpreted.
5. Conclude why sensory receptors are the correct answer: Sensory receptors are the structures that allow the brain and nervous system to perceive and interact with the external environment, making them the correct answer in this context.